Driving with children can not make mistakes

Some parents drive in order to take care of their children more conveniently. They will place the children in the co-pilot position. This is actually a more dangerous move. Because the children are all very curious, if you reach out to touch the gear lever

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Arrangement of equipment wells without sublevel caving

Equipment well layout - equipment wells are not open for each stop, but generally one or two are arranged according to actual needs in one stage. Generally, the equipment well is arranged outside the collapse limit of the lower plate every 150 to 300 meters along the strike direction. If the equipm

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