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【单选题】
设某随参信道的最大多径时延差等于10ms，为了避免发生选择性衰落，试估算在该信道上传输的数字信号的码元脉冲宽度为（ ）。A.
1~20ms
B.
0~30ms
C.
40~70ms
D.
30~50ms
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】How many options do you have when you travel by train in Vietnam?
A.
One
B.
Two
C.
Three
D.
Four
【单选题】听力原文：M: Hey Linda, do you get that letter about the new options for food service next year? W: Not yet. Are there a lot of changes? M: There sure are. Instead of paying one fee to cover all meals for ...
A.
All students pay the same amount per year.
B.
Students choose how many meals a week they will pay for.
C.
Students get money back for meals they don't eat.
D.
Some students get free meals.
【简答题】1)When do the choices get harder? 2) How many options can our brains react to quickly? 3) What will most people do when they are presented with severalreally good options? 4) What can help us make tho...
【简答题】人机界面是 DCS 系统的 。
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