问题
单项选择题
目前，“掺铒光纤放大器（EDFA）+（）+非零色散光纤（NZDSF，即G.655光纤）+光子集成（PIC）”正成为国际上长途高速光纤通信线路的主要技术方向。
A.光时分复用（OTDM）
B.光频复用（OFDM）
C.光码分复用（OCDM）
D.密集波分复用（DWDM）
答案
参考答案：D
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目前，“掺铒光纤放大器（EDFA）+（）+非零色散光纤（NZDSF，即G.655光纤）+光子集成（PIC）”正成为国际上长途高速光纤通信线路的主要技术方向。
A.光时分复用（OTDM）
B.光频复用（OFDM）
C.光码分复用（OCDM）
D.密集波分复用（DWDM）
参考答案：D
| 根据对话内容，从方框中的六个选项中选出五个合适的句子补全对话。 | |
| Linda: Hello, __1__. Peter: I'm reading a book about the people's lives in the future. Linda: Oh, it's interesting. What will the people's lives be in the future? __2__ Peter: Yes, I think so, but I hope not. Linda: __3__ Peter: Because there won't be enough food, fuel and room for too many people on the earth! Linda: That's true. __4__ Peter: It's too hard. But maybe people will have on space stations (空间站) on the moon and grow vegetables (种植蔬菜) there. Linda: __5__. By the way, do you think everyone will speak the same language in the future? Peter: I hope so. Then people in different countries will understand each other better.
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