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复用技术可以使用户共享信道进行通信,降低成本,提高利用率。

A. 对
B. 错

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Itwassocoldthatthetravelershadthefire______allthenight.

A. burning
B. toburn
C. burn
D. burnt

Theyaregoingtohavetheserviceman_____anelectricfanintheofficeroomtomorrow.

A. install
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C. tobeinstalled
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Youmusthavethepaper______bytheendofthismonth.

A. finish
B. tobefinished
C. finished
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“Doyoumind_____?”“Goahead.”

A. turningonthefan
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C. toturnonthefan
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