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【单选题】
有关ISDN的陈述中，( )是不正确的A.
ISDN是综合业务数据网
B.
其提供经济、有效、端到端的数字连接以支持广泛的服务，包括声音与非声音的服务
C.
用户只需通过有限的网络连接及接口标准，可实现大区域范围乃至全球范围内存取网络信息
D.
ISDN的系统结构主要讨论的是局域网和ISDN交换系统之间的接口
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【简答题】When a call ,what are the ways to sound as good as you really are ?
【单选题】When making a call, sometimes there will be something wrong with the phone or telephone line. Which of the following expressions is not right when expressing the problems?
A.
The phone is in order.
B.
She has changed her telephone number.
C.
I’ve tried to get through several times but it's always engaged.
D.
Sorry, we were cut off.
【简答题】when a call what are the "do's"?
【单选题】When making a call, sometimes there will be something wrong with the phone or telephone line. At this moment, you can NOT say:
A.
I've tried to get through several times but it's always engaged.
B.
Sorry, we were cut off.
C.
The phone is out of order.
D.
Would you like to leave a message?
【单选题】When making a call, sometimes there will be something wrong with the phone or telephone line. Which of the following expressions is not right when expressing the problems?
A.
I've tried to get through several times but it's always engaged.
B.
Sorry, we were cut off.
C.
The phone is in order.
D.
She has changed her telephone number.
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