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【单选题】
常用的控制元件包括:压力控制阀、流量控制阀和()。
A.
压力控制阀
B.
流量控制阀
C.
方向控制阀
D.
动作控制阀
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A.
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B.
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D.
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A.
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A.
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B.
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C.
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D.
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A.
正确
B.
错误
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