Light fittings with metal parts should always be earthed.有金属部件的照明装置都应该走地线。It is desirable that compensating cables be run in earthed conduit.补偿导线最好在地下管道中穿过.He carefully earthed up the roots of the newly - planted tree.他仔...
Light fittings with metal parts should always be earthed.有金属部件的照明装置都应该走地线。He carefully earthed up the roots of the newly - planted tree.他仔细地在新栽的树的根部培上土.It is desirable that compensating cables be run in earthed conduit.补...