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Because the mobile devices, such as mobile phone and tablet PC, are sold at a cheaper price but performance better and better with the development of ICTs, more and more Chinese learners can afford these devices and use them to learn. This project explore a course framework to integrate m-learning technology into online courses, which are used in School of Continue Education, Peking University. This...
If there were hard boulders or rock layers distributed in the formation of pile foundation, it was difficulties to the drilling hole-pile. Blasting before drilling was used in hard rock layer; underwater control millisecond initiation was used in hole-pile; cumulative blasting was used in hard boulders; blasting was used in outshoot stones. Construction efficiency was greatly improved.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.