A.9.0m,0.54m/h B.9.0m,0.81m/h C.7.0m,0

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问题 A.9.0m,0.54m/hB.9.0m,0.81m/hC.7.0m,0.54m/hD.7.0m,0.8lm/h

选项 A.9.0m,0.54m/h
B.9.0m,0.81m/h
C.7.0m,0.54m/h
D.7.0m,0.8lm/h

答案 C

解析
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