单项选择题
A.20℃±1℃;95%B.20℃±2℃;90%C.20℃±2℃;95%D.20℃±1℃;90%
A.0.500%±0.001%B.0.500%±0.003%C.0.500%±0.005%D.0.400%±0.005%
A.0.1%B.0.2%C.0.3%D.0.4%
A.3B.5C.8D.10
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