cable direct burial laying直埋敷设
cable direct buried laying电缆直埋敷设
firing by direct laying直接瞄准的火炮射击
cable direct laying[通信] [电] 电缆直接敷设
spiral casing direct laying method蜗壳直接埋入法
gun firing by direct laying直接瞄准火炮射击
fire barrier by direct laying直接瞄准射击
laying out direct直接开示