下列方程中分式方程有（ ）个．（1）x2-x+1x；（2）1a-3=a+4；（3

阅读短文，看表格，完成下列各题。

      There are forty-eight students in my class. Some students go to school on foot. Some students go to

school by bike. Some students go to school by bus. Some students go to school by subway. Some students

go to school with other ways.

1. There are _____________ (填数字) students in my class.

2. _____________ (填数字) students go to school by subway.

3. Sixteen students go to school _________________.

4. Eight students go to school _____________ bike.

5. Eight students go to school by _____________.

窗体是Access数据库中的一个对象，通过窗体用户可以完成下列______功能。 ①输入数据 ②编辑数据 ③存储数据 ④以行、列形式显示数据 ⑤显示和查询表中的数据 ⑥导出数据

A．①②③

B．①②④

C．①②⑤

D．①②⑥

由于（），使龙门刨床侧刀架加工试件垂直度超差。

A.工作台导轨直线度超差

B.机床安装调整变形

C.立柱导轨直线度超差

D.侧刀架导轨精度超差

当今时代进行信息管理的核心手段是（）。

A．基于网络的信息处理平台

B．委托咨询公司

C．设立信息管理部门

D．信息的分类