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【单选题】
下列关于哺乳动物受精的叙述, 错误 的是( )。A.
受精常发生在输卵管内
B.
精子和卵子已在受精前完成了减数第二次分裂
C.
精子的细胞膜与卵子的细胞膜融合
D.
受精前成熟的精子需获能
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【简答题】Some names have special meanings in popular American expressions. One day, an average Joe was walking down the street. An average Joe is a common person – either male or female. He did not know where ...
【单选题】质询是属于科学方法四大基本要素的()。
A.
Hypotheses
B.
Characterizations
C.
Experiments
D.
Presentments
【简答题】阅读理解。 Some names have special meanings in popular American expressions. One day, an average Joe was walking down the street. An average Joe is a common person-either male or female. He was lost. He di...
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