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【多选题】
Refer to the exhibit. Users from the Engineering VLAN complain that every time Business VLAN users have a network connectivity issue， the Engineering VLAN users usually have problems experiencing slow response or network connectivity problems. After troubleshooting， an unauthorized switch 2 was found. This unauthorized switch has been a regular problem， assuming the root bridge function under the spanning-tree domain and causing the Engineering VLAN to be unstable. Which three of these actions could be suggested to fix the problem？（）A.
Upgrade Spanning Tree Protocol to Rapid Spanning Tree Protocol.
B.
Change Business VLAN PCs to switch 1 and switch 4.
C.
Force the root bridge to be switch 2， instead.
D.
Adjust spanning-tree timers （max-age and forward-delay）.
E.
Shut down all unused ports.
F.
Use MSTP to separate the Engineering VLAN from the Business VLAN to optimize spanning-tree convergence time within each VLAN.
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A.
UNIFACE采用模型驱动，构件式的应用构造策略
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【单选题】下面关于企业级应用开发平台UNIFACE的叙述中，哪个是不正确的?
A.
UNIFACE采用模型驱动，构件式的应用构造策略
B.
UNIFACE的开发语言是JAVA
C.
UNIFACE支持WEB应用的开发
D.
UNIFACE可应用于构造大型而复杂的业务应用系统
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