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【单选题】
若两个事件A和B同时出现的概率P(AB)=0,则A.
事件 A 和B 互不相容
B.
AB是不可能事件
C.
AB未必是不可能事件
D.
P(A)=0或P(B)=0
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【单选题】关于产程分期,正确的是:
A.
第一产程初产妇潜伏期不超过20小时
B.
第一产程经产妇潜伏期不超过8 小时
C.
第二产程初产妇不超过2小时
D.
第二产程经产妇不超过1小时
E.
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【简答题】Your parents must be in the library, ________?
【单选题】________it is________you obtain, you must tell your parents. [ ]
A.
Whatever; that
B.
No matter what; /
C.
What; that
D.
Whatever; /
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