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【多选题】
对于弹性敏感元件的材料要求中,正确的是A.
弹性滞后和弹性后效要小
B.
具有良好的稳定性和耐腐蚀性
C.
弹性模量的温度系数要大
D.
线膨胀系数要大且稳定
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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】If you were older , I ____ you to go
there yesterday .A. will allow B. should allow C. would have allowed D. had allowed
【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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