问题
填空题
ADSL将用户双绞线频谱低频部分提供普通电话业务（）通道，通过无源滤波器使其与（）分开。
答案
参考答案：POTS；数字信道
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ADSL将用户双绞线频谱低频部分提供普通电话业务（）通道，通过无源滤波器使其与（）分开。
参考答案：POTS；数字信道
| 情景交际 (有两个多余项) 。 | |
| A: It's dark. We have to be back now. B: Yes. Look at the tree! __1__ We are sure to get out of the woods. A: __2__ B: Let me use the compass. Oh, you are wrong. It is east. A: __3__ B: Then let's follow this direction and walk straight. A: Let's go. __4__ (About half an hour later) A: Look there. __5__ B: Yes. We'll get home soon.
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