题目内容

利用稳压管或二极管的正向电压降,可以稳压吗?

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在国际单位制中,温度属于(),其他六个物理量属于(),两者区分是前者()叠加,后者()叠加。

隧道内的整体道床可以修建在风化的岩层上。

A. 正确
B. 错误

井下爆破后,炮烟未吹散前不要进入工作面,以防吸入炮烟中毒。

A. 正确
B. 错误

When using carbon dioxide to fight a fire on a bulkhead,the CO2 should be applied().

A. first to the bottom of the flaming area,sweeping from side to side,and following the flames upward
B. in a circular motion from the middle of the bulkhead outward
C. to the top of the flaming area,sweeping from side to side,and working toward the bottom
D. in an up-and-down motion from one side of the bulkhead to the other

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