A.1
B.
C.
D.
[单选题]A.B.C.D.
[单选题]( ).A.B.C.D.
[单选题]A.3~10kVB.3~24kVC.35kVD.110kV
[单选题]A.L平行于πB.L在π上C.L垂直于πD.L与π斜交