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It is a must to check the relevant pump when metal chips are found.

A当有金属碎片时必须检查临近的泵。

B当发现金属痕迹时，必须检查所有的泵。

C当发现金属碎屑时，必须检查相应的泵。

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正确答案：A （备注：此答案有误）

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