下面属于公用电话业务的有:()
A.普通IC卡公话
B.多媒体公话
C.201公话
D.公话超市(IP超市)
E.办公电话
参考答案:A, B, C, D, E
The dog may be a good companion for the old. ________, the need to take it for walks may be a
disadvantage.[ ]
A. Besides
B. However
C. Therefore
D. Instead
在对称三相交流电路中,线电流为相电流的3倍。