采用直流输电联网的特点是（）。
A.功率调节快速可靠
B.能完全隔离两端交流系统的相互影响
C.损耗小
D.限制短路电流
参考答案：A, C, D
Nanjing isn't so large_____Shanghai,however,it's the second_____city in East China.[ ]
A. like; largest
B. as; largest
C. like;large
D. as;large
喷射过渡
