我国工业和民用电源为三相交流电源,下面()的说法是不正确的。
A、三相交流电源采用的是三相四线制
B、线电压为380伏
C、线电压为220伏
D、相电压为220伏
参考答案:C
— Excuse me, sir. Is the swimming pool open all day as it used to be?
— _____. only from 6:00p.m to 10:00p.m.[ ]
A.That's right
B.Yes, of course
C.Sorry, I'm not sure
D.Sorry, I'm afraid not
简述语言特性。