下心盘磨耗时须焊修，焊后热处理，平面磨耗超过（）mm，直径磨耗超过4mm时焊修。
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提高过滤机真空度的措施有（）。
A. 过滤机槽中的矿浆液面要保持一定的高度
B. 要保持真空系统的密封良好
C. 经常检查分配头的摩擦片，磨损严重的要及时更换
D. 加强真空泵的操作、维护和管理，确保真空泵有足够的真空度和抽气量
E. 检查清洗滤布和滤扇，发现破损及时修补
You develop a Web control. The Web control consists of labels and associated text boxes.You need to ensure that the Web control has both toolbox and visual designer support. What should you do?（）
Add a Web Control Library project to your solution. Define a class that inherits from CompositeControl.
B. Add a Windows Control Library project to your solution. Define a class that inherits from UserControl.
C. Add a Web User Control to your project. Define a class that inherits from UserControl.
D. Add a Mobile Web User Control to your project. Define a class that inherits from MobileUserControl.
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