问题
单项选择题
钻具称重时,油泵输出的压力油经()泄回油箱。
A.单向阀
B.溢流阀
C.调速阀
答案
参考答案:B
钻具称重时,油泵输出的压力油经()泄回油箱。
A.单向阀
B.溢流阀
C.调速阀
参考答案:B
综合填空。用方框中的词填空,不要求改变词形。(满分10分)
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