【单选题】In what condition could the shop assistant exchange the product for the customer?
A.
The customer makes no more complaints.
B.
The customer can show her receipt.
C.
The customer is still unhappy with it.
D.
The customer brings it back within a week.
【简答题】数字通信系统的重要质量指标之一是有效性,请分析提高数字通信系统信息传输有效性的措施。
【单选题】因为两个传输速率相等的系统其传输效率并不一定相同,所以真正衡量数据通信系统的有效性指标是()。
【判断题】( ) 表示数据传输有效性的指标是误码率,是衡量数据传输系统在正常工作状态下传输可靠性的参数。
【单选题】The shop could exchange the product if the customer______.
A.
makes no more complaints
B.
can produce the receipt
C.
is still unhappy with it
D.
brings it back within a week
【多选题】吊顶大面积造型施工中不能使用的吊顶饰面料为
【判断题】数字通信系统有效性的指标是传输速率,传输速率越高,有效性越好。( )
【单选题】Customer: Could you hold the door open for a moment, please? Salesman: Certainly. ______