问题
单项选择题
手抬泵冬季停机后，应旋下泵壳底部（），放尽泵内存水，以防结冰时破坏。
A.阀门
B.锥形螺母
C.锥形螺塞
D.锥形螺丝
答案
参考答案：C
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手抬泵冬季停机后，应旋下泵壳底部（），放尽泵内存水，以防结冰时破坏。
A.阀门
B.锥形螺母
C.锥形螺塞
D.锥形螺丝
参考答案：C
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