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【单选题】
A new server was installed. Most clients are located in the same subnet as the server and can successfully access the server. Clients located on different subnets have been unable to access the server, but have no trouble accessing other servers on their subnet. Which of the following is the reason that these clients are unable to access the server?（）A.
DHCP has assigned the wrong addresses.
B.
Incorrect default gateway on the server.
C.
DNS entries were not created.
D.
WINS server is not responding.
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【单选题】如图,已知在窗体中有一个名为 button1 的 Button 按钮以及一个名为 toolTip1 的 ToolTip 控件,下列代码能够使用户移到一个 Button 按钮上后,显示帮助提示的是()。
A.
this.toolTip1.SetToolTip(" 单击查看数据表 ",this);
B.
this.toolTip1.SetToolTip(this," 单击查看数据表 ");
C.
this.toolTip1.SetToolTip(this.button1," 单击查看数据表 ");
D.
this.toolTip1.SetToolTip(" 单击查看数据表 ",this.button1);