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【简答题】
某机器有10000个零件组成,每个零件损坏时彼此独立的,其中有N(1) = 1000个零件损坏的概率P(1) = 0.0003,有N(2) = 2000个零件损坏的概率为0.0002,有N(3) = 7000个零件损坏的概率为0.0001。当10000个零件中有2个或2个以上损坏机器就停止工作。求此机器停止工作的概率。
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反馈参考答案：
举一反三
【单选题】5 3. The sentence "They are free to listen to and live by their circadian rhythms." ( Line 3, Paragraph 4 ) probably means ____
A.
they can lead their daily lives according to their biological clocks, without referring to a man-made clock.
B.
they can listen to the wonderful rhythms of the biological clock and live close to them.
C.
they can live by regulating their own circadian rhythms.
D.
they are free from the annoying rhythms of everyday life
【单选题】I would like to rent a house, modern, cozy and ________ in a quiet environment.
A.
after all
B.
before all
C.
above all
D.
first of all
【单选题】I would like to rent a house, modern, comfortable and in a quiet neighborhood.
A.
all in all
B.
above all
C.
after all
D.
over all
【单选题】听力原文：M: I would like to move to the suburbs, but I don't have enough money to pay the high taxes. W: I wish you could. It's nice to live there. Q: Why isn't the man moving to the suburbs? (18)
A.
The rent is too high.
B.
He doesn't like the suburbs.
C.
He can't afford the high taxes.
D.
It's too expensive to hire taxies.
【单选题】Morphemes like "friend", "boy", "girl" are _____ morphemes, because they can be used on their own.
A.
free
B.
bound
【判断题】If log-t production decline curve is linear, it indicates harmonic decline.
A.
正确
B.
错误
【单选题】"They are their own business" in paragraph 4 most probably means________.
A.
one may put his own interest before that of teh company's
B.
one is reponsible for his own career
C.
one should always keep the ambition of opening his own business
D.
an employee should always ask for comensation from the employer
【单选题】设有预处理命令 #define d 2 int a=10;float b=20;char c=’a’ 则下列语句错误的是 ____
A.
a++
B.
b++
C.
c++
D.
d++
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