小明家离学校115米．他上午去学校上学和下午放学回家一共要走多少米？
115×2=230（米）；
答：一共要走230米．
建立表结构的SQL命令是( )。
A) CREAT CURSOR B) CREAT TABLE C) CREAT INDEX D) CREAT VIEW
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.
A．same
B．similar
C．different
D．difference
