B、没有区别
C、select*fromAleftouterjoinBonB.id=A.idandA.dt=20140301
D、select*fromAleftouterjoinBonB.id=A.idwhereA.dt=20140301
A.Be sure not to touch it
B.Be not sure to touch it
C.Be sure to not touch it
D.Don’t be sure to touch it
A.keep away from
B.keep up with
C.keep in touch with
D.put up with
A、in the open
B、in touch
C、in the dark
D、on the air