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47.Howdomanyscientistsviewagingnow?A)Itmightbepreventedandtreated.B)Itcanbeasriskyasheartdisease.C)Itresultsfromavitamindeficiency.D)Itisanirreversiblebiologicalprocess.
题型：单选题
选项
A.
in the ventilation system
B.
in the reservoirs
C.
in the humidifiers
D.
in the air intake
正确答案：B