哪种功能不是直流配电屏的基本功能（）。
A、分配电能
B、整流输出电能
C、产生告警
D、保护负载
参考答案：B
—I'm thinking of the test tomorrow. I'm afraid I can't pass this time.
— ! I'm sure you'll make it. [ ]
A. Go ahead
B. Good luck
C. No problem
D. Cheer up
简述尘源控制和原则？
