三相交流电只能用三相交流发电机才能产生。
参考答案:对
下列各项,不属于水肿治疗基本原则的是()
A.发汗
B.利尿
C.泻下
D.活血
E.逐水
More than five __________ people went to the concert last night.
A. thousand B. thousands C. thousands of