题目内容

I have no doubt ________he will overcome all his difficulties.

A. if
B. that
C. as to
D. whether

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I heard Tom _______ (sing) in his room.

The machine _________ (export) to Italy needs repairing.

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关于临产后宫缩特点,正确的是

A. 有节律的阵发性收缩,由弱到强并维持一定时间
B. 自子宫两角开始,以每分钟约2cm速度向子宫下段扩展
C. 宫缩的极性是指底部最弱,下段最强
D. 体部肌纤维收缩时变短变宽,松弛时恢复原状