柴油发电机组作应急自备电源具有哪些优点（）。
A.操作简捷、起动迅速
B.效率较高
C.过载能力强
D.运行可靠、维修方便
参考答案：A, B, D
The lawyer listened with full attention，（）to miss any point.
A. not trying
B. trying not
C. to try not
D. not to try
