【单选题】雷云对电力架空线路的杆塔顶部放电时,线路绝缘子可能被击穿并对导线放电,因此而产生的过电压称为()
【判断题】一次电路指 担负输送和分配电能这一主要任务的电路,也称主电路或主结线。
【判断题】雷云对电力架空线路的杆塔顶部放电时,线路绝缘子可能被击穿并对导线放电,因此而产生的过电压称为雷电反击过电压。
【简答题】Several organisations are strongly opposed to the use of children in advertising in general, and in _____________in particular.
【单选题】A) By advertising through supporting several sporting events financially. B) By branching out into new areas. C) By taking part in a couple of sporting events. D) By organizing a meeting with an adver...
【简答题】Ways of Advertising Advertising reaches people through various forms of mass communication. The chief advertising media are newspapers, television, and radio. Newspapers offer advertisers several adva...
【判断题】发电厂和变电所中的一次设备,按一定的要求和顺序连接成的电路,称为电气主接线,也称主电路,又称一次接线。
【简答题】工厂供配电系统中,承担 、 和 电能任务的电路,称为“一次电路”,也称“主电路”。