单项选择题
A.0.4%~90% B.10%~90% C.20%~80% D.30%~70%
A.1/4 B.1/2 C.1/3 D.2/3
A.20℃±2℃ B.20℃±5℃ C.23℃±5℃ D.25℃±2℃
A.±1% B.±5% C.±8% D.±10%
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