A.線路首端; B.線路末端; C.線路平均; D.線路最高。
A.9.80665Pa B.133.322Pa C.98.0665kPa D.101.325kPa
A.消耗性材料; B.裝置性材料; C.全部材料; D.設(shè)計(jì)給定的材料。
A.0.5% B.1% C.2% D.3%
A.40kV/2.5mm B.50kV/2.5mm C.60kV/2.5mm D.70kV/2.5mm