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...
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...