在线名词解释大全 - 题目2 - 详细

47.Howdomanyscientistsviewagingnow?A)Itmightbepreventedandtreated.B)Itcanbeasriskyasheartdisease.C)Itresultsfromavitamindeficiency.D)Itisanirreversiblebiologicalprocess.

A
in the ventilation system
B
in the reservoirs
C
in the humidifiers
D
in the air intake
正确答案:
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