问题
单项选择题
光通信系统的误码率一般应小于（）。
A、1×10-6
B、1×10-7
C、1×10-8
D、1×10-9
答案
参考答案：D
搜题请搜索小程序“爱下问搜题”
光通信系统的误码率一般应小于（）。
A、1×10-6
B、1×10-7
C、1×10-8
D、1×10-9
参考答案：D
I like my Chinese teacher very much. He is a 16 man, about 25 years old. He is tall 17 black short hair. He is a very humorous(幽默的) person. He often 18 us jokes(笑话) and 19 to make our class more 20 . In class, he is a very 21 teacher. If we don’t listen to him carefully, he will give us some punishment(惩罚) by 22 us some questions. But after class, he becomes a very good 23 of us. He often talks with the girls and plays 24 with the boys. All of us really like him. He is our 25 teacher.
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