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【单选题】
据以往资料表明,某一 3口之家,患某种传染病的概率有以下规律:P{孩子得病}=0.6,P{母亲得病│孩子得病}=0.5,P{父亲得病│母亲及孩子得病}=0.4.求母亲及孩子得病但父亲未得病的概率。A.
0.3
B.
0.2
C.
0.12
D.
0.18
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皮皮学刷刷变学霸
举一反三
【单选题】________ she realized what was happening, she was hit on the head.
A.
When
B.
Before
C.
Since
D.
As
【单选题】______ she had time to realize what was happened, she was hit on the head.
A.
Since
B.
Before
C.
When
D.
Until