a certain angle to cause the rock to take action in the inclined state is when the weather is on the ground or on the obstacles. it is on the day of or damage the stone or damaged. the operation is canceled, is injured, is the uc785ub294 accidents often take on students. therefore, this invention is a concave convex shape or a round shape, a special type of wine production is on the bolt head and the external exposure can not be set in the same part, and the assembly can be made. the grass or grain is on the middle, is the day to go to take a difficult task to judge the speed of it is just to be able to improve the work efficiency. on the day of the ground and is on the ground before a first bump, on the day of injury and the obstacle is the emergency to prevent the safety accident prevention, can prevent the development of conflict is on the day of the invention.
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