不能预防风心病孕妇发生心衰的是（） A.吸氧 B.产时产后给予镇_爱下问搜题

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问题单项选择题

不能预防风心病孕妇发生心衰的是（）

A.吸氧

B.产时产后给予镇静剂

C.静注麦角新碱预防产后出血

D.胎儿娩出后在腹部放置沙袋

E.手术缩短第二产程

答案

参考答案：C

问答题

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选择题

Guangzhou was the second Chinese city to host the Asian Games because Beijing ________ the event

before.[ ]

A. had held

B. was held

C. held

D. had been held