Who told the man the news
A. His sister.
B. His father.
C. His mother.
D. His brother.
关于紫外线消毒，叙述不正确的是
A. 紫外线灯管应常用70%醇棉球擦拭
B. 紫外线的杀菌作用只限于直接照射
C. 灯管距地面的距离为1.5～2m
D. 4～12室温时，紫外线输出量最高
E. 温度过高或过低均影响紫外线杀菌能力
He loves keeping his own opinion to himself.
苯扎溴胺溶液泡手的浓度是
A. 0.01%
B. 0.1%
C. 0.2%
D. 1%
E. 2%
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