3.产妇发生宫缩乏力导致产后出血时，下面可以采取哪些措施促进子宫收缩
A. 按摩子宫
B. 宫腔填塞纱条
C. 给予催产素肌肉注射
D. 舌下含服卡孕
设随机变量X的方差存在, D(X)> 0，则以下结果正确的是
A. D(X)>D(1-X)
B. D(X) C. D(X)=D(1-X)
D(X)+D(1-X)=1
设随机变量X~N(0, 1), Y~N(1,4), X与Y相互独立，则P(X
A. 大于0.5
B. 小于0.5
C. 等于0.5
D. 等于1
Why the author wasnot sure if he would be able to survive 150 thousand years ago?
A. Because he was chased by his prey.
Because sport was the key to survive at that time while the authour was not a sporty guy.
C. because he would now be the guy carrying the killed prey, while the others, the ones who run faster, would be the ones hunting the prey.
D. becausehe is not running as fast as he used to.
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