A.直埋敷設(shè) B.電纜溝敷設(shè) C.電纜隧道敷設(shè) D.電纜排管敷設(shè)
A.≤30° B.≤35° C.≤40° D.≤45°
A.≤1‰ B.≤1.5‰ C.≤3‰ D.≤5‰