单项选择题
A.3.5t/hB.10t/hC.20t/hD.3t/h
A.1.4t/hB.1.5t/hC.1.6t/hD.1.8t/h
A.5t/hB.10t/hC.2.5t/hD.41.6t/h
A.6%—36.5%B.4%—45.6%C.12%—45%
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