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当前学科:通信工程师综合能力
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无源光网络的双向传输技术中,()方式上行信号和下行信号分别与不同的多址进行模二加,然后调制为相同波长的光信号,在同一根光纤上传输。
A . 空分复用
B . 波分复用
C . 码分复用
D . 副载波复用
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Every year just after Christmas the January Sales start.All the shops reduce their pricesand for two weeks,they are full of people looking for bargains.My husband and I do not nor-mally go to the sales as we don’t like crowds and in any case are short of money as we have tobuy lots of Christmas presents. Last year,however,I took my husband with me to the sales at the large shop in the centerof London.We both needed some new clothes and were hoping to find a television set.Whenwe got to station.So I left my husband and started looking around the shops.Unfortunately allthe clothes were in very large sizes and SO were not suitable for me.But I did buy.a televisionat a very cheap price,SO I felt quite pleased with myself. When I arrived at the station,my husband was not there.So I sat down in a nearby cafeto have a cup of tea.I quickly finished my tea when I saw my husband and went out to meethim.He looked very happy.Then I saw he Was carrying a large and heavy cardboard box.“Oh,dear!”I thought.Yes,we had no new clothes but two televisions.We shall not be going to the sales again. 根据以上内容,回答题。In January__________.
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