单项选择题
A.U相×I相×cosøB.U线×I线×cosøC.3×U线×I线×cosøD.√3×U线×I线×cosø
A.防直击雷防护B.感应雷防护C.雷电侵入波防护D.泄漏雷电流
A.Ctrl+CB.Ctrl+Alt +CC.Ctrl+VD.Ctrl+Alt+V