PCM通信就是把模拟信号经过抽样、量化、编码三个过程变成()。
A.二进制数字信号
B.文字信号
C.图像信号
D.脉冲信号
参考答案:A
补全短文。根据短文内容及首字母提示,填写所缺单词。
A: Excuse me, could you (1)h______ me?
B: Yes, of course.(2)W______ it?
A: I want to go to Sunshine Town, but I don't know the (3)w______ to it.
B: Oh, it's easy. Let me tell you. (4)T______ left at the second crossing. Walk (5)s____
on. Then (6)c______ a bridge. Walk along the river. Take the second (7)t______ on
your left. You will (8)s______ it on your right.
A: Can I (9)t______ a bus?
B: No, it's not (10)f______ from here.
A: Thank you very much.
B: You are welcome.
理水假山的堆叠÷人工供水的水管、电缆铺设在立基前后都可以;预留蓄水池及水道不需要与层叠同步考虑。