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单选题
650、如果在泵中发现金属颗粒,找到它们的来源并修复有缺陷的部分
A
lf you find metal particles in the reservoir find their source and repair the broken part.
B
lf you find metal particles in the pump find their source and repair the defective part.
C
If you find material particles in the pump, find their source and repair the damaged part.
答案解析
正确答案：B
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