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单选题
如果过滤器在异常短的时间后堵塞，将它们送到实验室进行污染分析。
A
If the filters become clogged after an unusually short time, send them to the laboratory for analysis of the contamination.
B
When the filters become clogged in an abnormal short time, send them to the library to analyze the contamination.
C
When the filters become blocked unconventionally after a very short time , send them to the lab for calculation of the contamination.
答案解析
正确答案：A
相关知识点：
滤器短堵塞，送 lab 分析
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