A.傳遞B.轉(zhuǎn)換C.獲取D.斷開
A.屏蔽層完整無(wú)損壞B.絕緣皮無(wú)損壞C.絕緣皮無(wú)痕跡D.屏蔽層有點(diǎn)損壞或切斷
A.無(wú)規(guī)則B.有規(guī)則C.有氣孔D.有沙礫