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【简答题】
为什么 电子产品故障率 l ( t ) 曲线的特征是两端高、中间低,呈浴盆状?
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反馈参考答案：
举一反三
【单选题】I paid only 5 pounds for the book , _______I expected it would cost.
A.
not as many as
B.
not so much as
C.
cheaper than
D.
not so expensive
【单选题】I think Book 6 is ________ than Book 5.
A.
much difficult
B.
very difficult
C.
more difficult
D.
the most difficult
【简答题】设A、B为两个相互独立的事件P(A∪B)=0.6，P(A)=0.4，则P(B)等于( )。
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