题目内容

RC电路的R不变,C变小,其时间常数将( )。

A. 增大
B. 减小
C. 不变
D. 不确定

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液压传动系统中,常用的的压力控制阀是()

A. 节流阀
B. 调速阀
C. 溢流阀
D. 减压阀
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F. 单向阀
G. 换向阀

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