承载信息量的基本信号单位是()。A.码元 B.比特 C.数据传输速率D.误码率
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There were fifty- two persons present, counting __________ the babies.
A. over
B. with
C. to
D. in
Every year we give ________ 200 million pounds of clothing away to the African Country.
A. over
B. off
C. in
D. up
You can donate directly ______ a charity or run a charity event.
A. for
B. to
C. in
D. on
But so far there ___________ no true water wars.
A. has been
B. have been
C. is
D. are