单项选择题
A.±0.1% B.±0.2% C.±0.3% D.±0.5%
A.5%和90% B.5%和85% C.10%和85% D.10%和90%
A.5min B.10min C.15min D.20min
A.0.6 B.0.5 C.0.4 D.0.3
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