问题
单项选择题
在PON中ONU复用光纤的技术不包括（）。
A、光时分多址（OTDMA.
B、光波分多址（OWDMA.
C、光码分多址（OCDMA.
D、光空分多址（OCPMA.
答案
参考答案：D
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在PON中ONU复用光纤的技术不包括（）。
A、光时分多址（OTDMA.
B、光波分多址（OWDMA.
C、光码分多址（OCDMA.
D、光空分多址（OCPMA.
参考答案：D
| 补全对话 | |
| A: What are you going to do after leaving school? B: I'm thinking about becoming a pilot. That way I would be able to travel. A: 1 B: Of course I do. I like to visit different places, make different friends and learn different things. A: That sounds good. You seem to be very healthy. 2 B: It's just so so. I find it difficult to learn it well. A: What can you do if you are not good at English? B: 3 I'll try to learn it better. 4 A: Maybe I'll try to be a businessman. I'd like to go into business and make some money. B: 5 . A: But I think being busy is better than doing nothing. B: Yes. I agree with you.
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