在木门的门框的靠墙的一面开设背槽是为了()
A.与门扇之间连接密闭
B.防靠墙一面受潮变形
C.门框与墙体连接紧密
D.可使门框的外观美观
参考答案:B
It is said that Chen Shuibian is ________ to flee from Taiwan because of the campaign against him.[ ]
A.possible
B.perhaps
C.probable
D.likely
设z=x2+y2+xy,则=()。
A.2x+2y+x
B.2x+2y+y
C.2x+x+y
D.2x+y