单项选择题
A.40%~85%B.45%~85%C.50%~85%D.55%~85%
A.0.5Kg/cm2B.1.5Kg/cm2C.2.5Kg/cm2D.3.5Kg/cm2
A.柜内总体积的70%B.柜内总体积的75%C.柜内总体积的80%D.柜内总体积的90%