How are you?[ ]
A. How are you?
B. Fine, thank you.
答案:B
胎膜大部分在何时破裂()
A.临产后宫口开大6~7cm
B.临产后宫口开大4~5cm
C.临产后宫口开大2~3cm
D.临产后宫口近全
E.临产后宫口开全
欧航空器在航线上的飞行由()管制中心提供空中交通管制服务。
A.航线
B.塔台
C.进近
D.区域