单项选择题
A.2.5,1.2,1.5B.2.0,1.2,1.5C.1.5,1.3,1.8D.1.7,1.3,1.8
A.1500hB.1200hC.1000hD.800h
A.0.2B.0.3C.0.4D.0.5