A、错误
B、正确
A.完全竞争、垄断竞争、完全垄断、寡头垄断
B. 完全竞争、垄断竞争、寡头垄断、完全垄断
C. 完全竞争、寡头垄断、垄断竞争、完全垄断
D. 完全垄断、寡头垄断、垄断竞争、完全竞争
A.SELECT*FROMorderWHEREYEAR(签订日期)=2007ORDERBY金额DESC
B.SELECT*FROMorderWHILEYEAR(签订日期)=2007ORDERBY金额ASC
C.SELECT*FROMorderWHEREYEAR(签订日期)=2007ORDERBY金额ASC
D.SELECT*FROMorderWHILEYEAR(签订日期)=2007ORDERBY金额DESC