A. 散射光分布均匀 B. 散射光分布不均勻 C. 颗粒直径远大于入射光波长 D. 颗粒直径远小于入射光波长 E. 颗粒直径与入射光波长无关
A. SELECT max(sal),deptno,job FROM EMP group by sal; B. SELECT max(sal),deptno,job FROM EMP group by deptno; C. SELECT max(sal),deptno,job FROM EMP; D. SELECT max(sal),deptno,job FROM EMP group by job;