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
Itwassocoldthatthetravelershadthefire______allthenight.
A. burning
B. toburn
C. burn
D. burnt
Theyaregoingtohavetheserviceman_____anelectricfanintheofficeroomtomorrow.
A. install
B. toinstall
C. tobeinstalled
D. installed
Youmusthavethepaper______bytheendofthismonth.
A. finish
B. tobefinished
C. finished
D. beingfinished