【单选题】有一不知对称与否的三相负载,其每相额定电压为380V,再将它接到线电压为380v的电源上,应采用( )接法。
【判断题】家用电器在使用过程中,可以使用湿手操作开关。()
【简答题】What could you meet in Switzerland? You could meet ______, hotels and the friendliest people.
【单选题】三相负载星形联接接到三相电源上,每相负载承受电源的?
【单选题】—Could I please go to the movies? —Yes, ______. [ ]
【简答题】【图片】如图所示△联接负载负载接到相电压为220V的三相星形电源上,每相负载阻抗Z=4+j3欧。请问三相负载吸收的有功功率P= kW(请直接填入数值,如25.3)。
【简答题】What could you get in return for your ~250 donation? You could give a name to ____________________
【单选题】— Do you think I could borrow these magazines? — _______
B.
You could borrow other magazines.
C.
The magazines aren’t here now.
D.
I’m sorry, but the magazines you want are out.
【简答题】三相对称负载三角形联接,每相负载的电阻R=10Ω、感抗XL=10Ω,接到相电压为220V星形联接的三相对称电源上。计算每相负载的相电流、线电流、功率因数和三相负载总的有功功率
【判断题】家用电器在使用过程中,可以用湿手操作开关。()