Teacher(Tno,Tname,Tage,Taex);Department(Dno,Dname,Tno);Work(Tno,Dno,Year,Salary)假设Teacher的Tno属性，Department的Dno属性及Work的Year属性上有B+树索引，说明下列查询语句的-种较有的处理方法。（1）select*from teacher where Tsex=‘女’（2）Select*from department where Dno<301（3）Select*from work where Year<>2000（4）Select*from work where year>2000and salary<5000（5）Select*from work where year <2000or salary<5000