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present perfect continuous tense use of since and for

TChon 14 PRESENT PERFECT WITH SINCE AND FOR.doc

TChon 14 PRESENT PERFECT WITH SINCE AND FOR.doc

Tiếng anh

... Topic4: MY NEIGHBORHOODPERIOD 14. PRESENT PERFECT WITH SINCE AND FOR A. Revision: The Present Perfect Tense 1. Form - Affirmative: S + has/have +V3/ed…. - Negative: ... there.) = John has lived in that house since 1984. (Giả sử hiện nay là 2004) 3. Note:Cách dùng SINCE và FOR: - For + a period of time (FOR + khoảng thời gian:) For two hours/a week/20 minutes/50 ... worked here for a year. (He began working here a year ago and still works here.) - We do not use for + all (all day/all my life etc.): * I've lived here all my life. (not &apos ;for all my...
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Tài liệu ngữ pháp tiếng anh   present perfect  since and for

Tài liệu ngữ pháp tiếng anh present perfect since and for

Ngữ pháp tiếng Anh

... done Since and For Since and For Note the difference between since since and for for .five o’clockyesterdaylast summer1996he was a child since + point in time for + length of timeten ... computer hasn’t given me any problems __________ last year. Example: since since for for since since for for since since Form 2 Form 2 Past participles can be regularregular or irregularirregular.Gates ... Use the present perfect with since + point in time to show when something started.future1975pastnow since 1975.has written several books Present Perfect: Since and For Bill Gates and...
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Tài liệu Present perfect continuous & Present perfect continuous and simple pptx

Tài liệu Present perfect continuous & Present perfect continuous and simple pptx

Kỹ năng nói tiếng Anh

... Đừng quấy rầy tôi bây giờ. Tôi đang làm việc. Present perfect continuous & Present perfect continuous and simple Unit 9. Present perfect continuous A It has been raining. Xem ví dụ sau: ... Hurry up ! We’re waiting. We’ve been waiting for an hour.  Present perfect continuous and simple Unit 10. Present perfect continuous and simple A Nghiên cứu ví dụ sau: Ann’s ... been raining for two hours. Trời đã mưa được hai tiếng đồng hồ. Chúng ta dùng thì present perfect contiuous cho những trường hợp này, đặc biệt là dùng với how long, for … và since Hành động...
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Báo cáo y học:

Báo cáo y học: "Use of chinese and western over-the-counter medications in Hong Kong"

Y học thưởng thức

... patterns of bothChinese and western medical consultations and OTC use in a representative sample of the Hong Kong popu-lation. This information will provide timely input for planning pharmacists’ and ... 5:41http://www.cmjournal.org/content/5/1/41Page 9 of 9 Use of Chinese OTC medications and consultations with Chinese medicine practitionersA total of 19.0% of the population used Chinese OTCmedications only whereas 7.2% used both ... socioeconomic and health related factors as independent variables and patterns of OTC and medical service use as dependentvariables. Dependent variables were classified as ‘OTC use only’ and ‘using...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 1 pptx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 1 pptx

Ngư nghiệp

... years through the development and use of a succession of live food organisms as feed for the developing larvae. The aim of the present manual was therefore to review and summarise the latest developments ... The success of any farming operation for fish and shellfish depends upon the availability of a ready supply of larvae or ‘seed’ for on-growing to market size. However, for many fish and shellfish ... depending on the species and culture technique applied, may account for up to 15% of the total production cost. Optimization of live food production and use in hatcheries has therefore become even...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 2 doc

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 2 doc

Ngư nghiệp

... were widely used and represented over 90% of the volume of algal culture produced in 23 facilities. Figure 2.16. Requirements for cultured algae in hatchery and nursery culture of bivalve ... of feeding strategies and zootechnical aspects, still often results in less predictable culture performance. Despite extensive research efforts, the use of artificial diets in the culture of ... rate and in this way the growth rate and not the cell density is kept constant. Laing (1991) described the construction and operation of a 40 l continuous system suitable for the culture of flagellates,...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 3 ppt

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 3 ppt

Ngư nghiệp

... female, Fig. 3.17.), are ideal for storage and transport and can be used as inocula for mass cultures. Mass production of rotifers for cyst production is performed in batch cultures in concrete ... Production and use of resting eggs For the mass rearing of rotifers as larval food the amictic way of reproduction (see 3.3.) should be favored. However, when the interest is in production of resting ... 20:5n-3 and 22:6n-3 have been used. Since the stability and storage possibility of these products is relatively low they are usually made on the spot and used immediately. For very specific applications,...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 4 pptx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 4 pptx

Ngư nghiệp

... potential for exploitation. In: Book of abstracts of contributions presented at the International Conference “Improvement of the commercial production of marine aquaculture species”. G. Gajardo and ... growth and success of metamorphosis of many species of fish and crustaceans, but also with regard to their quality, e.g. reduced incidence of malformations, improved pigmentation and stress resistance. ... being developed for oral delivery of vitamins, chemotherapeutics and vaccines. Furthermore, a better knowledge of the biology of Artemia was at the origin of the development of other Artemia...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 5 docx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 5 docx

Ngư nghiệp

... function of the tank size and the density of cysts incubated. Excessive foaming can be reduced by disinfection of the cysts prior to hatching incubation and/ or by the addition of a few drops of a ... hydration of the cysts (as complete removal of the envelope can only be performed when the cysts are spherical), removal of the brown shell in a hypochlorite solution, and washing and deactivation of ... content and hatchability. Hatchability of cysts is largely determined by the conditions and techniques applied for harvesting, cleaning, drying and storing of the cyst material. The impact of most...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 6 docx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 6 docx

Ngư nghiệp

... fish Both live and frozen adult Artemia are used as food for aquarium fish species. Cysts are also purchased by these users and hatched for feeding as nauplii. Survival, vigor and pigmentation ... Artemia is generally used for feeding the late larval and postlarval stages of penaeids. Freshly-hatched nauplii are usually offered at the start of the first mysis stage, and sometimes even ... all over the world for enhancing the nutritional value of Artemia with essential fatty acids. Figure 4.3.7. Schematic diagram of the use of Artemia as vector for transfer of specific components...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 7 pptx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 7 pptx

Ngư nghiệp

... attractive for the predators. Table 4.4.3. Artificial seawater formulations used for tank production of Artemia (ing.l-1). For the Dietrich and Kalle formulation, solutions A and B are prepared ... evaluation of dry food is the consistency of the food quality and supply, and the possibility for storage without loss of quality. It follows therefore that bulk products must be stored in a dry and ... Engineering 11: 107-119. Dhont J., Lavens, P. and Sorgeloos, P. 1993. Preparation and use of Artemia as food for shrimp and prawn larvae. In: CRC Handbook of Mariculture. 2nd Edition. Vol 1: Crustacean...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 8 pptx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 8 pptx

Ngư nghiệp

... the cysts and the relative humidity of the air. For example, at a relative humidity of 70 to 75% cysts may reach a water content of about 10 to 15% after a maximum of 48 h, and drying for a longer ... (degradation of organic matter by bacteria) and the nutrient level in the intake water, nitrogen often limits algae growth. The use of nitrogen fertilizers is therefore widespread. Four types of inorganic ... advantages and disadvantages of organic fertilizers. The organic fertilizers most often used in aquaculture are chicken, quail and duck manure. Cow, pig and goat dung have also been used but...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 9 pptx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 9 pptx

Ngư nghiệp

... value of Daphnia 6.1.3. Feeding and nutrition of Daphnia 6.1.4. Mass culture of Daphnia 6.1.5. Production and use of resting eggs 6.1.6. Use of Moina 6.1.1. Biology and life cycle of Daphnia ... and 3.4%, respectively). Specific levels of EPA and DHA are respectively 6% and 17% in adults fed Dunaliella, and 18% and 32% in adults fed Rhodomonas. In nauplii the levels of EPA, DHA and ... weight of Tigriopus can be harvested during 89 days at maximal densities of 22,000 animals.l-1; the amount of yeast used for a 1 kg production of Tigriopus being 5 to 6 kg. 5.2.6. Use of resting...
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Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 10 pptx

Tài liệu Manual on the Production and Use of Live Food for Aquaculture - Phần 10 pptx

Ngư nghiệp

... production and use of live food organisms as feed for the developing larvae. The present manual reviews and summarizes the latest developments concerning the production and use of the major ... Daphnia and Moina 6.1.1. Biology and life cycle of Daphnia 6.1.2. Nutritional value of Daphnia 6.1.3. Feeding and nutrition of Daphnia 6.1.4. Mass culture of Daphnia 6.1.5. Production and use ... zooplankton, and copepods, nematodes and trochophores. The document has been prepared to help meet the needs of aquaculture workers of member countries for the synthesis of information in the field of...
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