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单选题
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
If you find metal particles in the reservoir, find their source and repair the broken part.
B
If 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
相关知识点：
泵里有颗粒，找源修缺陷
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