泵站检修标准规定、柱塞与导向铜套的最大配合间隙不大于（）mmA._爱下问搜题

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问题单项选择题

泵站检修标准规定、柱塞与导向铜套的最大配合间隙不大于（）mm

A.0.15

B.0.175

C.0.2

D.0.215

答案

参考答案：C

选择题

The child _______ trees for the whole four hours with his parents. [ ]

A. plants

B. have been planting

C. has been planting

D. has been planted

问答题简答题

简述磁电相位差式扭矩传感器的基本工作原理。