题目内容

Every visitor to Georgia is ______ by the kindness, charm and hospitality of the people.

A. overflowed
B. overwhelmed
C. surrounded
D. welcomed

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Resourceful as he is, he has ______ of ideas and cannot help it.

A. run out
B. used up
C. wasted away
D. gone through

基带信号是一般指频率从（）开始的信号。

NRZ码的优点是（）、易实现。

NRZ码中有（）成份，无（）成份，（）丰富，无（）检测能力。