电子商务发展的四个时期:EFT时代、电子报文传送技术、联机服务和()。
A.WWW
B.HTML
C.HTTP
D.TCP
参考答案:A
_________professional violinist practices for several hours a day, but__________ violinist has his own way of playing the Beethoven concert.
A.Each, every
B.Every, each
C.One, a
D.All, each
什么是批处理命令?