Jack Sumner was a guide and outfitter who ran a trading post in the Colorado Rockies.
杰克·萨姆纳曾作为向导兼装备店商在科罗拉多落矶经营一家商埠。
Mr. Mason called Jack, Mary, Peter...to post their photos on the wall.
梅森先生叫了杰克、玛丽、彼得……把他们的照片贴在墙上。
By analyzing the structure of upright post and hydraulic jack, this essay introduces the structure of a rational and practical upright post or hydraulic jack, which also can be repaired easily.
前言：通过对立柱、千斤顶的结构进行对比、分析，介绍了合理、实用并便于检修的立柱、千斤顶应具有的结构。
This paper expounds the design of processing techniques before hole-boring on the cylinder of upright post and hoisting jack used in the hydraulic support.
阐述了液压支架所用立柱、千斤顶的缸筒在上深孔钻镗床进行镗孔、滚压之前必须进行的加工工艺的设计。
This paper expounds the design of processing techniques before hole-boring on the cylinder of upright post and hoisting jack used in the hydraulic support.
阐述了液压支架所用立柱、千斤顶的缸筒在上深孔钻镗床进行镗孔、滚压之前必须进行的加工工艺的设计。
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