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【单选题】
In England and Wales, why did the first 'gay marriages' take place 15 days after the law recognizing same-sex partnership became effective?A.
The couple has to declare publicly, in written form, that they are willing to marry each other at least two weeks before the wedding ceremony.
B.
It normally takes the couple 15 days to get ready for the wedding.
C.
It takes time for the public to accept 'gay marriages'.
D.
People still have a bias against 'gay marriages'.
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【多选题】脉冲波多普勒技术的局限性是（）
A.
测流速不受检测深度影响
B.
增大脉冲重复频率影响对流速检测
C.
高脉冲重复频率减少信号混叠
D.
测血流速度受脉冲重复频率影响
E.
深度影响最高流速检测
【单选题】列出没有职工的部门( )
A.
select dept.deptno from emp,dept where emp.deptno(+)=dept.deptno and emp.deptno is null;
B.
select dept.deptno from emp,dept where emp.deptno(+)=dept.deptno and dept.deptno is null;
C.
select dept.deptno from emp,dept where emp.deptno(+)=dept.deptno and emp.deptno=null;
D.
select dept.deptno from emp,dept where emp.deptno=dept.deptno(+) and dept.deptno is null;
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