三级三级三级A级全黄,久久综合久久综合九色,成人午夜高潮a∨猛片,高潮毛片无遮挡高清视频播放

ZHANGJIAKOU RANRAN MACHINERY CO. LTD (Short:RANRAN MACHINERY) is a high-tech Joint-stock company, located in Wudun industrial park, Qiaoxi district, Zhangjiako, Hebei province. Since its founding RANRAN MACHINERY adhering to the ‘sciecombine thebusiness valuesand business philosophy, andtrain a number ofhighlycohesive andresponsibleworkforce. There are excellent technical team, who develop and design drilling equipment, and fruitfulscientific research achievements in R & Dcenter. RANRAN MACHINERY hast strong production and processing capacity, advanced castingtechnology, and reliable quality. And RANRAN MACHINERY owns ahigh-precision numerical controlmachiningcenter to ensurethe accuracy of thespare parts, advanced high-frequencyheat treatmentprocess to ensure the durability of thespare parts; advancedoptimal combinationfor assembly technologyto makeour products morereliability, durability andmaintainability. With high-efficiency and low-cost product applications RANRAN MACHINERYgain the market opportunities forproducts.

ntific and technological innovative products, integrity build brand’ business philosophy,

RANRAN MACHINERY focuses always on the customer demand. With many years ofresearch and development RANRAN MACHINERY keep always theprinciple ‘moreinnovation, quick improvement’ for production, and it is atechnology leader for similar products inthe domestic and foreign.

GSD, YSD series drill head style drills, GSP-C Drill-table style drills and GFD reverse circulation style drills are independentresearched and developed,designed, and manufacturedby RANRAN MACHINERY. They are mechanical productswith independentintellectual property rights anda number of nationalpatentsformechanical products, and they are drillequipments with multi-purpose, multi-drilling technology (positive and reverse circulation for mud, air, etc.). The products are widely used indrillingwellsfor, urbandrinking water wellsand constructionof water seepagewells,ground source heat pwells andother engineering such as thedrillingof pileswells.

irrigation

ump

The products of RANRAN MACHINERY are soldat home and abroad with advanced performance andgood service. In recent years,RANRAN MACHINERY cooperates with the Ministry of Commerce to carry out theUNaid projectsin Africa and the projects about the geologicalsurvey, construction, prospecting and drilling with domestic majoroverseasgroup companies, domestic and foreign tradeimport and export companies and embassyin China. The products are nowexported to Asia, Africa, South America, Europeand many other countries.