单项选择题
A.手消毒 B.戴单层手套 C.洗手 D.戴双层手套
A.87% B.55% C.65% D.95%
A.0.1%～0.2% B.0.2%～0.3% C.0.2%～0.5% D.0.5%～0.8
A.10% B.12% C.9% D.15%
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