单项选择题

10个螺丝钉中有3个不合格品；随机取4个使用，4个全是合格品的概率是（）。A.1／6B.1／5###SX

A.1/6
B.1/5
C.1/4
D.1/3

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热门试题

单项选择题

Speaker A：Oh，doesn’t your daughter look lovely？Speaker B：（）

A．Oh，no.She looks just so so.
B．Yes，I’m proud of her.
C．Really？Why do you think so？
D．Well，your daughter looks lovely，too.

单项选择题

Speaker A：Mr.Carson，Dr.Brown will have to change your appointment to tomorrow at the same time.He’s still waiting for a flight out of New York.Speaker B：（）

A．Oh，well，thank you for calling.I’ll see him in his office then.
B．I’m sorry to hear that his flight is delayed.
C．But are you sure he will be in his office at that time？
D．Yes.That’s quite understandable.

10个螺丝钉中有3个不合格品；随机取4个使用，4个全是合格品的概率是（ ）。A.1／6B.1／5###SX

10个螺丝钉中有3个不合格品；随机取4个使用，4个全是合格品的概率是（）。A.1／6B.1／5###SX