2 When the two stages are simultaneously harvested, the upper stage should be advanced, and the advanced distance should not be less than the length of one stop; when mining extremely thick ore bodies, the adjacent adjacent stope should be stepped forward;
3 Forced to collapse the top plate or retain the ore as a cushion, the thickness of the cushion shall not be less than 20m ;
4 The compensation space coefficient of extrusion blasting should be 15 %~ 20 %; the compensation coefficient of small compensation space should be 20 %~ 25 %; the compensation coefficient of free space blasting should be more than 25 %.
The inflatable arch sprinkler, children can pass through the curtains, play in the backyard, courtyard and lawn, bringing a lot of summer fun in the hot weather. The inflatable sprinkler is made of high -quality thick PVC materials, which is durable to prevent holes or puncture.
The Inflatable Sprinkler Items is easy to use. It needs to be inflated with a gas pump to the sprinkler (excluding), connect it to any garden hose, and then fill the base with water to help it stand stably. Dowry smoothly in the holes. By the way, if it is flipped or over, the water in the base must be full.
The inflatable sprinkler is not only suitable for summer outdoor sprayed toys for children, boys and girls, but also very suitable for children's swimming pools, beach lawn and children's birthday party. Any interesting parents can run with their children under the sprinkler, for a few hours, bringing a lot of fun in hot summer weather.
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Lixin Outdoor Product Co., Ltd , https://www.jmairfuniture.com