单项选择题
A.1000ml/hB.1200ml/hC.1500ml/hD.2000ml/h
A.50,500B.64,640C.64,512D.60,500
A.20-800ul/15minB.20-800ul/hC.0.1-4ml/15minD.0.1-4ml/h
A.±2%B.±3%C.±4%D.±5%
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