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问题 单项选择题

超声预示即将排卵的声像图是（）

A.卵泡张力高，透声好，直径20mm左右

B.卵泡外周有回声晕圈

C.卵泡内膜变成锯齿状

D.卵泡向卵巢边缘靠近

E.以上均是

答案

参考答案：D

单项选择题

Generally accepted methods for translating project objectives into tangible deliverables and requirements is also referred to as ______ .

A) product analysis
B) risk measurement
C) alternatives identification
D) benefit/cost analysis
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问答题 简答题

试述柴油机—发电机组的功率输出过程？
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