A. 注意的分散 B. 注意的转移 C. 注意的持续 D. 注意的分配
A. select * from emp wher sal in (2000,3000); B. select * from emp wher sal like (2000,3000); C. select * from emp wher sal = (2000,3000); D. select * from emp wher sal between 2000 and 3000
A. 0℃以下 B. 0℃~5℃ C. 5°~10℃ D. 不低于-20℃