单选题

Keep all the parts that are serviceable and discard those that are broken.

A保留勤务部件，更换那些损坏的。

B报废损坏的部件后，保留所有可用的。

C保留所有可用的部件，报废那些损坏的。

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正确答案：A （备注：此答案有误）

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