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.正确答案A
