A.直埋敷設(shè) B.電纜隧道敷設(shè) C.電纜溝敷設(shè) D.電纜排管敷設(shè)
A.30mm B.50mm C.80mm D.100mm
A.1/5 B.1/6 C.1/7 D.1/8 E.1/9