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问题 单项选择题

超声诊断前置胎盘时应（）

A.膀胱过度充盈

B.膀胱适度充盈

C.在孕20周前诊断准确性最高

D.测量胎盘下缘距宫颈外口的距离

E.膀胱无需充盈，直接腹部检查

答案

参考答案：B

选择题

22．Lawrence Craven, a doctor from the USA，is the author of several published reports, one of______ introduced the idea in 1953 ______aspirin could reduce the risk of heart attacks．

A．them; when

B．which; that

C．what; that

D．which; when
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单项选择题 A型题

辛夷的鲐矧部宝是（）

A.开放的花朵

B.花序

C.花蕾

D.花托

E.花柱
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