单选题

If the filters become clogged after an unusually short time, send them to the laboratory for analysis of the contamination.

AA lab analysis of the contamination is required to the frequently clogged filters.

BWhen you find the filters blocked in a very short time, ask the vendor to inspect them for any contamination.

CIf the filters get clogged at an unusually early stage, send them to the laboratory to analyze the
Contamination.

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正确答案：A （备注：此答案有误）

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