社会组织和个人有何义务？

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

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.

A. 申不害
B. 管仲
C. 邹衍
D. 吴起