單項(xiàng)選擇題
A.0.7 B.0.8 C.0.9 D.1.0
A.5.1 B.5.2 C.5.3 D.5.4
A.0.01 B.0.02 C.0.03 D.0.04
A.20 B.25 C.30 D.35
A.8 B.10 C.15 D.20
A.60kV B.50kV C.35kV D.30kV