单项选择题
A.±5cmB.±10cmC.±20cmD.±30cm
A.600m/hB.800m/hC.1200m/hD.1500m/h
A.600m/hB.800m/hC.1200m/hD.3600m/h
A.160个/米B.320个/米C.400个/米D.640个/米
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