单项选择题
A.￠300mm B.￠800mm C.￠600mm D.￠400mm
A.60°/60sec B.60°/50sec C.60°/40sec D.60°/30sec
A.机油 B.35#机油 C.水乙二醇 D.矿物油
A.0.5m/s B.0.1m/s C.1m/s D.1.5m/s
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