单项选择题
A.0.1% B.0.2% C.0.3% D.0.4%
A.5% B.2% C.1% D.3%
A.500lux B.550lux C.600lux D.650lux
A.7≤PH≤8 B.6≤PH≤8 C.6.5≤PH≤8 D.8≤PH≤9
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