【单选题】Peking Opera has ________ main types of performers
【单选题】What are the four roles of Peking opera?
A.
Sheng,Dan,Jing and Chou
【单选题】一What will happen to the children if Jim and Mary ? 一I don’t know but I think it’s a really terrible thing.
【判断题】在对称三相电路中,负载作星形连接时,线电压是相电压的3倍,线电压的相位超前相应的相电压30°。
【单选题】采用( )方式,生产线上只需维持 2~3 个小时的用量,基本是“零库存”
【单选题】受伤肢体严重肿胀,组织广泛破坏、出血和坏死,多为:
【单选题】在对称的三相电路中,三角形连接时,线电压 U L 是相电压 Up 的( )倍,相位上对应线电流比对应相电流( ) 30° 。(填超前或滞后)
【判断题】Character roles in Peking Opera are generally divided into four main types. They are sheng, dan, jing, chou.
【多选题】对称电路中,三角形三相电源有( )。 °
A.
线电流是相电流的√3,且滞后相应相电流30°