问答题

贝类人工育苗定义

答案：是指从亲贝的选择、蓄养、诱导排放精卵、受精、幼虫培育及采苗，均在室内而且是在人工控制下进行。

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The negative sign in the First law of diffusion denotes ( ). A.
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The direction of diffusion is the same as that of concentration gradient. C.
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