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【判断题】
湍 流可以是均匀流,也可以是非均匀流。A.
正确
B.
错误
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【简答题】阅读理解。 John lived with his mother when he was young. He didn't know who his father was. The woman did some washing for the rich and could buy only some bread for her son. So the boy was short and thin....
【简答题】阅读理解。 John lived with her mother when he was young. He didn't know who his father was. The woman did some washing for the 'rich and could buy onl'y some bread for her son. So the boy was short and th...
【单选题】假设盒中有10个木质球，6个玻璃球，玻璃球中有2个红色4个蓝色，木质球中有3个红色7个蓝色，现从盒中任取一球，用A表示“取到蓝色球”，用B表示“取到玻璃球”，则P(B|A)=
A.
6/10
B.
6/16
C.
4/7
D.
4/11
【单选题】设盒中有10个木质球,6个玻璃球。木质球有3个红球,7个蓝色;玻璃球有2个红色,4个蓝色。现在从盒中任取一球,用A表示“取到蓝色球”,B表示“取到玻璃球”,则 ( )
A.
6/10
B.
6/16
C.
4/7
D.
4/11
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