总配线架产品的主要功能有:()。
A、接续
B、防护
C、告警
D、测试
参考答案:A, B, C, D
— I am afraid I've lost the book. I borrowed it from the library.
— _____. [ ]
A. Good.
B. It's very kind of you to say so.
C. That's all right.
D. What a pity !
夜间行车,要尽量避免超车,确需超车时,可变换远近光灯向前车示意。