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问题 单项选择题

下列细胞中具有有丝分裂能力的是

A．中幼红细胞
B．晚幼粒细胞
C．晚幼红细胞
D．杆状核粒细胞
E．单核细胞

答案

参考答案：A

解析：晚幼以下阶段的细胞基本失去了分裂能力。

单项选择题

If Blankenship Enterprises has to switch suppliers in the middle of a large production run, the company will not show a profit for the year. Therefore, if Blankenship Enterprises in fact turns out to show no profit for the year, it will also turn out to be true that the company had to switch suppliers during a large production run.
The reasoning in the argument is most vulnerable to criticism on which one of the following grounds

A．The argument is a circular argument made up of an opening claim followed by a conclusion that merely paraphrases that claim.

B．The argument fails to establish that a condition under which a phenomenon is said to occur is the only condition under which that phenomenon occurs.

C．The argument involves an equivocation, in that the word "profit" is allowed to shift its meaning during the course of the argument.

D．The argument erroneously uses an exceptional, isolated case to support a universal conclusion.

E．(E) The argument explains one event as being caused by another event, even though both events must actually have been caused by some third, unidentified event.
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单项选择题 A1型题

下列各项，不属导致晚期产后出血直接原因的是（）。

A.胎盘残留

B.胎儿过小

C.蜕膜残留

D.子宫复旧不全

E.剖宫产伤口裂开
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