在磨机与分级组成的磨矿回路中，分级设备将磨矿产物进行分级得到合格产品送往下道工序，而不合格产物返回磨机再磨的磨矿分级流程叫（）
参考答案：闭路磨矿
补全对话
Peter:Hi, Sally. Come and have a look at my photos.
Sally:Are these the photos you took in Africa, Peter?
Peter: 1 Look, this is a wildebeest. It's an animal in Africa.
Sally: 2
Peter:No, it doesn't. It only eats grass.
Sally:Are there a lot of animals in Africa?
Peter: 3
Sally:Oh, this photo looks interesting. What are you doing there?
Peter: 4
Sally:Did you have a good time there?
Peter:Ofcourse. 5
具体的成本核算对象是根据企业生产的特点加以确定的，不用考虑成本管理上的要求。( )
