第18题: [单项选择]DBMS的含义是( )。有SQL语句:
SELECT DISTINCT系号FROM教师WHERE工资>= ;
ALL(SELECT 工资 FROM 教师 WHERE 系号=“02”)
该语句的执行结果是系号( )。
A. “01”和“02” B. “01” 和“03” C. “01”和“04” D. “02”和“03” 参考答案:A 答案解析:本题SQL语句的含义是检索有教师工资大于或等于系号为“02”的所有教师工资的系号。
第24题: [单项选择]It can be inferred from the passage that the matching process in visual recognition is______. A. not a neural activity B. not possible when an object is viewed for the first time C. not possible if a familiar object is changed in some way D. now fully understood 参考答案:B