问题 单项选择题

卫星通信中广泛应用差错控制技术,以提高系统抗干扰性和在卫星功率受限情况下提高通信容量。卫星通信中常用的技术为()

A.CRC、FEC

B.ARQ、CRC

C.FEC、ARQ

D.ARQ、CRC

答案

参考答案:A

听力题

根据以下各句所给的首字母或汉语提示,用单词的正确形式填空,并将其写在答题卷上。

小题1:It was quite terrible. It took me some time to c___________ down myself.

小题2:Parents are always c_____________ much about their children.

小题3:I'm terribly sorry. I didn't do it on p__________.

小题4:It took her a long while to r___________ from her heart operation.

小题5:The children played ____________ (在户外)until it started to rain.

小题6:After the war, a new g_______________ was set up for that country.

小题7:The people p__________ at the meeting were all for the suggestion.

小题8:The ball went in the d_______________ of the man sitting in a boat on the river.

小题9:At the party a foreign teacher was r______________(要求) to sing some folk songs.

小题10:He was a young sailor on his first sea v______________.

小题11:The mother i_________ that he finish his homework first, which made his son very angry.

小题12:Whether you will succeed or not in doing the work depends on your a________ to it.

小题13:This song sounds f_____________ to me. I must have heard it sung somewhere before.

小题14:She ________________ (毕业)from Peking University last year.

小题15:The speech contest was o______________ well.

小题16:When she heard the news that her husband was killed in the accident, she b_______ into tears.

小题17:After the earthquake, the whole city was in r_________.

小题18:J_______ from his accent, we know he comes from the west.

小题19:Prices have _____________ (上涨) quickly.

小题20:The building was completely ______________(摧毁) by fire.

填空题