This paper describes measurement on noncylindrical gear,then introduces a measuring method for running clearance & tooth trace & variation of center distance & rotating angle & backlash and pitch line and so on.

The paper,through theoretical calculations,uses feedback controlling system based on round inductosyn to eliminat transmission backlash errors of worm gearing in rotation mechanism to satisfy the required precision of transimission.

Narrated the colouring phenomenon after the die and mold steel cacuum tempering and the necessity of vacuum tempering.

Different level of double mining room was experimented in 15~# gold ore veins which belongs to Jinchanggouling gold mine,ores geological serial number was 9154,used this method was to solve mining difficult problem in expansion and shrinkage with branching complex gold ore veins.

Study on the adding vacuum wetting procedure under the condition of total lamina technological process;

The results showed:Vacuum wetting procedure could improve the loose effect of lamina,reduce the rate of broken,improve the structure of tobacco,increase the rate of the wire,reduce the miscellaneous gas and excitability of cigarette,it had the advantage of killing the insects completely and thoroughly,but it could also reduce the cigarette smell,and improved the amount of nicotine and tar.