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当前学科：机械工程
题目：
未知类型
随机过程的数学期望和方差不随时间改变而变化，这种随机过程为非平稳随机过程。()
A.错误
B.正确
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筒述影响知觉的主观因素与客观因素。
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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