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选择课题要注意哪些事项?

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简述数字签名的实际使用原理

One of the functions of ventilation is to () the humidity of spaces containing sources of moisture, or to () the temperature of spaces not mechanically cooled such as the engine room.

A. increase;reduce
B. reduce;increase
C. increase;increase
D. reduce;reduce

工频耐压试验电压的测量误差一般要求不大于()。

A. 1%
B. 3%
C. 5%

利用刀具的成形方法有()。

A. 抻
B. 切
C. 削
D. 拨
E. 捏

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