【单选题】Why will it be fun having a baby in the woman's family?
A.
Because they are all excited about the baby.
B.
Because everyone wants to take care of the baby.
C.
Because they are all adults in the family now.
D.
Because the baby will bring them a lot of laughter.
【判断题】混合特征创建成功的条件之一为节点数相同。
【简答题】食品中脂肪的存在形式有 游离 态 和结合 态 两种。对于大多数食品来说, 脂肪是主要的, 脂肪含量较少。
【多选题】多选 影响干涉条纹对比度的主要因素是( )
【单选题】下面哪项不是影响干涉条纹对比度的主要因素
【单选题】查询出EMP表中COMM字段为空的记录( )
A.
select * from emp where comm='';
B.
select * from emp where comm=null;
C.
select * from emp where nvl(comm)=0;
D.
select * from emp where comm is null;