Micropowder of mullite is manufactured by gap mill.

采用环缝磨制备了莫来石微粉。

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The method of combining theory and experimentation is used to study the law of movement and characteristic of receiving force of the medium - balls in annular gap mill.

用理论结合试验的方法研究了环缝磨内介质球运动规律和受力特性。

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The fracture causes of joining bolt joined between feeder and quill shaft of ball mill are biggish gap between feeder and quill shaft, defective seal cone washed by ore pulp.

球磨机进料器与中空轴联接螺栓断裂原因是进料器与中空轴之间间隙过大，密封锥面受矿浆冲蚀而被破坏。

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Some measure of the challenges that await Black are the apparent gap between the best of the charter schools and the run-of-the-mill public schools where too many teachers think of tenure as a sinecure that spares them the need for serious innovation on the educational front.

FORBES: Let Cathie Black Dig Down Deep To Institute Major Education Reforms