Equipment must be supervised if children are in the house.如果孩子们在屋里，必须有人监管设备。He supervised and trained more than 400 volunteers.他指导和培训了400多名志愿者。The teacher supervised our drawing class.老师负责我们的图画课....
我用强力胶水粘上了开关,并焊接好了触点.I superglued the switch and the soldered the contacts.触点熔焊是继电器最为严重的故障形式之一.Welding is one of the worst faults electromagnetic relay.开关触点与线圈之间的电容通常在0.2～15pF之间.Capacitance from the switch contacts to the...