String sql="select * from stu_info where name='"+key+"'"; 该条语句的作用是?
A.
查询stu_info表中所有记录
B.
查询stu_info表中姓名为key的记录
C.
查询stu_info中name字段与关键字key相同的记录
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【判断题】Chinese opera has been hugely popular for centuries, especially the Beijing opera. Other types of opera include clapper opera , puppet opera, Kunqu and so on.
【简答题】Fill in the blanks to complete the summary of Passage A. Ever since its first official performance in Beijing in the year of 1790, Beijing Opera has been (e) 1 ups and downs. After its successful show...