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【单选题】
随机变量 x符合标准正态分布N(0,1) ,已知概率P(x
A.
整数
B.
正数
C.
负数
D.
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【单选题】One reason why the loss of lives in the Los Angeles earthquake was comparatively low is that
A.
new computers had been installed in the buildings
B.
it occurred in the residential areas rather than on the highways
C.
large numbers of Los Angeles residents had gone for a holiday
D.
improvements has been made in the construction of buildings and highways
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A.
环境
B.
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C.
服装
D.
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