搜题请搜索小程序“爱下问搜题”
问题 选择题
化简：(
a2
a-3
+
9
3-a
)÷
a+3
a
的结果是（　　）
A．-aB．aC．
(a+3)2
a
D．1
答案

(

a2
a-3
+
9
3-a
)÷
a+3
a
=
a2-9
a-3
•
a
a+3
=a．

故选B．

单项选择题

Which of the following is closest in meaning to what you’ve just heard

A．I have no doubt that she will type her paper tomorrow.

B．No one believes that she is a good typist.

C．I didn’t know she had so many pages to type tomorrow.

D．It seems that she won’t be able to complete her typing by tomorrow morning.
查看答案
单项选择题

SQL语言集数据查询、数据操纵、数据定义和数据控制功能于一体，语句ALTER TABLE实现哪类功能？

A．数据查询

B．数据操纵

C．数据定义

D．数据控制
查看答案