middlings meaning in Chinese

小麦粗粉
中级品二级品
中间产品
中煤

Study on separating middlings in self - production medium cyclone
自生介质旋流器洗选中煤的尝试
One of those mixed middlings he is
他就是个两性掺在一起的中性人。
Study on separate treatment of the middlings of electrical separation
电选中矿单独处理的研究
Study and prevention for middlings group water hazard in haizhi coal mine
海孜煤矿中煤组水害的研究与防治