皮皮学，免费搜题
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【单选题】
生精细胞第一次减数分裂发生于下述哪一过程
A.
精原细胞变为初级精母细胞
B.
初级精母细胞变为次级精母细胞
C.
次级精母细胞变为精子细胞
D.
精子细胞变为精子
E.
精原细胞自身增殖
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A.
いの
B.
いる
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あの
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