POC业务不属于用户使用的终端类型有（）
A.PC终端
B.手机终端
C.定制终端
D.pad终端
参考答案：D
二进制数10000001转换成十进制数是
A．119
B．121
C．127
D．129
The ARQ mode should be applied（）.
A.when two stations communicate with each other
B.in any radio system and at any time
C.when one ship sends a message to another station
D.for communication among some stations
