单项选择题
A.0.1% B.0.5% C.1% D.4%
A.3～5um B.5～6um C.12～15um D.7～10um
A.±0.50D B.±1.75D C.±1.0D D.±2.50D
A.±0.37D B.±0.25D C.±0.18D D.±0.12D
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