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You should look over this document carefully before (sign)_____ it.

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The company (found) _____over 20 years ago in Shenzhen by a Chinese businessman.

ABC Company tries hard for excellence with a committed attitude to carry out business (proper)_____.

理想电感元件存储磁能，也消耗能量。

A. 对
B. 错

降低电源电压后，三相异步电动机的起动转矩将__ 。

A. 降低
B. 不变
C. 提高
D. 无法确定