光通信系统的系统误码率一般应小于()。
A、1×10-6
B、1×10-7
C、1×10-8
D、1×10-9
参考答案:D
—He didn't go to the lecture this morning, did he?
— .Though he was not feeling very well. [ ]
A. No, he didn't
B. Yes, he did
C. No, he did
D. Yes, he didn't
党员权利第一条,党员享有学习权为()
A.参加党的有关会议
B.阅读党的有关文件
C.接受党的教育和培训
D.看内部参考