若将数据集中所作更改更新回数据库，应调用SqlAdapter的（）方法。
A.Update
B.Clos
C.Fill
D.Open
参考答案：A
An completely new district of industry has appeared in ________ used to be wasteland.
A．which
B．that
C．what
D．where
什么是需量和最大需量？
