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单选题
3170. If the filters become clogged after an unusually short time, send them to the laboratory for analysis of the contamination
A
A lab analysis of the contamination is required to the frequently clogged filters.
B
When you find the filters blocked in a very short time, ask the vendor to inspect them for any contamination.
C
If the filters get clogged at an unusually early stage, send them to the laboratory to analyze the contamination.
答案解析
正确答案：C
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