如图所示是电解氯化钠溶液（含酚酞）的装置．有毒气体收集的装置省略没有画出，两电极均是惰性电极．

（1）a电极的名称______．

（2）电解过程中观察到的现象______

（3）确定N出口的气体最简单的方法是______．

（4）电解的总反应离子方程式为______．

（5）若将b电极换成铁作电极，写出在电解过程中U型管底部出现的现象______．

(1) In the strength of the carrier signal is varied to represent binary 1 or 0.

(2) is a system that can map a name to an address and conversely an address to an name.

(3) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol

(4) is an approach that enables an ATM Switch to behave like a LAN switch.

(5) is an guided media which is made of glass or plastic and transmits signals in the form of light.

1（）

A．ASK

B．PSK

C．FSK

D．FDM