通防类（General defense category）.docVIP

通防类（General defense category） Pass question bank 1. The following substances play a major role in the occurrence of pneumoconiosis (A). A free silica 2, dust hygiene standards are based on (C) as the object. C. floating dust 3 which of the following substances does not lower the lower limit of the gas explosion concentration (C)?. C. inert gas 4, coal dust explosion process, generally from the source of explosion (B) m, the damage is lighter. B.10 to 30 5, the higher the volatile content of coal dust, the induction period (B). The shorter the B 6, it is important to judge whether there is coal dust participation in the explosion accident in underground mine (C). C. coke burning 7. The following measures for dust reduction are (D). D. coal seam flooding 8. The following measures for dust reduction are (C). C. tunnel cleaning water curtain 9, the water injection mode of coal seam is more adaptable to geological conditions (A). A. short hole injection 10, the water injection method of coal seam, the poor adaptability to geological conditions is long borehole water injection 11, coal mine safety regulations stipulates: coal mining face minimum allowable wind speed is 0.25 m / s. 12, coal mine safety regulations provides: mining area back into the air duct, the minimum allowable wind speed 0.25m / s. 13, coal mine safety regulations stipulates that: the minimum allowable wind speed of coal and semi coal rock roadway is (B) m / S. B.0.25 14, coal mine safety regulations: the rock lane minimum allowable wind speed 0.15m / s. 15. The maximum allowable wind speed is s (D) m / m in stope and stope gateway. D.4. 0 16, into the air shaft and working face fresh air dust content shall not exceed mg / m3 (A). A.0.5 17, coal mine safety regulations provides that the maximum roadway speed is (C4) m / s. 18 which of the following types of dust may explode in fire (A)?. A. suspended coal dust 19, which of the following gases can lower the explosive limit of coal dust (C)?. C. gas 20,