A.0.5mm B.1.0mm C.1.5mm D.2.0mm
A.1kV B.2kV C.5kV D.10kV
A.X線管陽極軸承磨損 B.剖相電容漏電 C.陽極啟動電路電壓過低 D.陽極啟動線圈燒斷