单项选择题
A.0.1 B.0.3 C.0.5 D.0.7
A.4[3,5]kg/cm2 B.3[2,4]kg/cm2 C.2[1,3]kg/cm2 D.5[4,6]kg/cm2
A.660[650,670] B.990[980,1000] C.600[590,610] D.900[890,910]