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在SQL语句中表达某个属性X为空,可以使用WHERE X=NULL。()
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SQL语句中逻辑运算AND和OR的优先级是一样。()
Before1905, there were two kinds of schools in China:_____,run by scholars teaching students at home, and official institutions which were open to children of nobles.
The history of higher education in China can be traced back to the_____Dynasty about 2,000 years ago. It established Taixue as the highest educational institute to cultivate senior scholars to help administer national affairs.
_________is an alternative to high school. Its objective is to train students in the incomprehensive vocational capability, preparing them for the front ranks of production, services, technical services, and management.
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