单项选择题
A.0.8,1 B.1.0,0.8 C.0.9,0.7 D.0.8,0.6
A.3%,2.5% B.2.5%,3% C.1.25%,1.5% D.4%,3%
A.4%,3% B.2%,3% C.2%,1.5% D.1%,1.2%
A.±0.1Hz,±0.2Hz B.±0.2Hz,±0.5Hz C.±0.25Hz,±0.3Hz D.±0.4Hz,±0.5Hz
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