关于珠江三角洲位置的叙述,正确的是( )
A.是全国最大的家用电器生产基地
B.毗邻港澳台,靠近东南亚
C.濒临东海,海陆空交通便利
D.位于北回归线以北,属于亚热带地区
答案:B
Which values are NOT permitted to be part of the primary key
A.alpha-numeric characters
B.punctuation
C.special characters
D.NULL
Your house is always so neat—how do you ______ it with three children?
A.manage
B.serve
C.adapt
D.construct