处理民族方面的人民内部矛盾的总的原则是什么？
参考答案：
团结——批评——团结
Mum__________ me to school as she knew it was important for me to receive education，but we were so poor then．
A．had sent
B．sent
C．would have sent
D．would send
针对设备性能的确认可以有哪几项方法（）
A、检定
B、校验
C、监测
D、自查
E、维护
