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阶段营养期 different nutritional stage
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在植物生长发育中，有一个转折时期，此阶段对外界环境条件敏感和营养元素的缺乏影响明显，即使补施亦难弥补，这个阶段称为（）。A、植物营养的阶段性B、植物营养最大效率期C、植物的营养临界期D、植物营养的选择性
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在植物生长发育中有一个时期，植物需要养分的绝对数量最多，吸收速率最快，肥料的作用最大，增产效率最高，此时期称为（）。A、植物营养的阶段性B、植物营养最大效率期C、植物的营养临界期D、植物营养的选择性
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单选题The problem with Elkhorn and stag horn corals lies in that _____.A
they were not much-liked by many peopleB
they were not well-known enough to be an iconC
they were not considered animals by many peopleD
they were not added to the list of Endangered Species
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单选题The peanut is ______.A
of little nutritional valueB
difficult to growC
a plant that exhausts the soilD
a source of protein
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填空题Now some consumers are willing to pay extra money for food with a special nutritional or health benefit.____
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