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单项选择题

为确保工程质量，对环境温度高于50℃处的变形缝止水带，要采用整条的是( )

A.带钢边的橡胶止水带
B.2mm厚的不锈钢止水带
C.遇水膨胀的橡胶止水带
D.耐老化的接缝用橡胶止水带
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单项选择题
In what now seems like the prehistoric times of computer history, the early postwar era, here was a quite widespread concern that computers would take over the world from man one day. Already today, less than forty years later, as computers are relieving us of more and more of the routine tasks in business and in our personal lives, we are faced with a less dramatic but also less foreseen problem. People tend to be over-trusting of computers and are reluctant to challenge their authority. Indeed, they behave as if they were hardly aware that wrong buttons may be pushed, or that a computer may simply malfunction.
Obviously, there would be no point in investing in a computer if you had to check all its answers, but people should also rely on their own internal computers and check the machine when they have the feeling that something has gone away. Questioning and routine double checks must continue to be as much a part of good business as they were in precomputer days. Maybe each computer should come with the following warming: for all the help this computer may provide, it should not be seen as a substitute for fundamental thinking and reasoning skills.
According to the passage, initial concerns about computers were that they might ____.（　　）
A.leadusintothepost-warera
B.bequitewidespread
C.takecontrol
D.takeoverroutinetasks
单项选择题
某投资者拥有的投资组合中投资股票A40%，投资股票B10%，投资股票C20%，投资股票D30%。A、B、C、D四只股票的收益率分别为10%、12%、3%、-7%，则该投资组合的预期收益率为()。
A.3.70%
B.4.50%
C.7.20%
D.8.10%
单项选择题
文化的结构是指构成文化的物质生产文化、制度行为文化和精神心理文化三者之间的关系
A、正确
B、错误
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