A.
B.
C.
D.
[单选题]A.不确定B.一级C.二级D.三级
[单选题]A.200B.250C.300D.350
[单选题]A.0.40Pa/mB.0.45Pa/mC.0.47Pa/mD.0.49Pa/m
[单选题]A.0.40Pa/mB.0.45Pa/mC.0.47Pa/mD.0.49Pa/m
[单选题]A.0.8g/kgB.1.0g/kgC.1.2g/kgD.1.4g/kg
[单选题]( ).A.B.C.D.
[单选题]A.1.5JB.3JC.4.5JD.15J
[单选题]A.1.5JB.3JC.4.5JD.15J
[单选题]A.1.5JB.3JC.4.5JD.15J