单项选择题
A.10~15km/hB.10km/h 以内C.5km/h 以内D.1~3km/h
A.K =6B.K =8C.K =10D.K =12
A.10mmB.15mmC.20mmD.25mm
A.2.0B.1.5C.1.3D.3.0
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