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【单选题】
关于受精,下列描述正确的是A.
性交后 1 - 5天的精子有受精能力
B.
受精通常是在输卵管壶腹部进行的
C.
卵母细胞是在受精前已完成第二次成熟分裂
D.
卵子排出后，如果 48小时不受精，则开始变性
E.
当一个获能精子进入一个次级卵母细胞透明带时，标志着受精的结束
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反馈参考答案：
举一反三
【简答题】曲线 与 所围第一象限内图形的面积 ____(以分数形式作答,如:4/5)
【单选题】This is the new plan for the holidays put forward by Bill which I don't subscribe. [ ]
A.
to
B.
on
C.
of
D.
about
【简答题】积分 ____ (以分数形式作答,形如:4/5)
【简答题】计算 ____ (以分数形式作答,形如:4/5)
【简答题】Put options o ___ i __ (未平仓量) is much higher than those on the call side suggesting a downward bias in the market.
【单选题】补全对话: O: Excuse me P: Yes? O: 1 (恐怕您不能将行李放在这里) P:Why not? It's not the aisle. O: 2 (但这是在紧急出口附近)? P: So where do I put it? O: 3 (我在客舱找一个地方). P:Thank you....
A.
1. I need to move it and get more space for this passenger's bag. 2. But it is near the emergency exit. 3. I'm afraid you can't put your baggage here.
B.
1.I'm looking for space for it in the cabin. 2.I'm afraid you can't put your baggage here. 3.But it is near the emergency exit.
C.
1.I'm afraid you can't put your baggage here. 2.But it is near the emergency exit. 3.I'm looking for space for it in the cabin.
【简答题】由曲线 与 所围成的平面图形的面积A= _ . (以分数形式作答,如:4/5)
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