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【单选题】
设随机变量Z的分布列为 X:135 P:0.40.50.1 则E(X)为（）。A.
1.1
B.
2.4
C.
1.6
D.
1.0
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皮皮学刷刷变学霸
举一反三
【单选题】The pioneers ahead of the main body of troops throw some lightweight, dark colored objests to ______.
A.
cross completely snow-covered landscape
B.
prevent themselves from suffering snow-blindness
C.
let the men behind them see something
D.
warm themselves in the cold
【简答题】a dark-colored dress
【单选题】Vitamin D deficiency will probably result in
A.
less bone fractures.
B.
dark-colored skins.
C.
suppressed immunity.
D.
inability to breathe.
【单选题】Experts advises to ______ in hot weather.
A.
wear dark colored clothes
B.
wear more
C.
eat more food
D.
drink more water
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