东北大学15春学期《井巷掘进与施工ⅰ》在线作业2（Northeastern University 15 spring semester drifting and construction I online homework 2）.docVIP

东北大学15春学期《井巷掘进与施工ⅰ》在线作业2（Northeastern University 15 spring semester drifting and construction I online homework 2） 15 spring term roadway driving and construction I online homework 2 First, radio questions (10 questions, 40 points) One The minimum thickness of shotcrete support shall not be less than () A. 200mm B. 150mm C. 100mm D. 50mm Correct answer: a Two The error of the starting elevation of tunnel and the design regulation shall be controlled within (). A. 50mm B. 100mm C. 150mm D. 200mm Correct answer: a Three Under the condition of conventional equipment, the height of a single pass boring chamber should be no more than () M. A. 5 B. 10 C. 15 D. 20 Correct answer: a Four The section shape of skip loading chamber is rectangular, and can be used when rock quality is poor and ground pressure is large. A. round B. horseshoe shaped C. square D. semicircle arch Correct answer: a Five The regulations of coal mine safety stipulates that the dust content in all workplaces under the mine shall not exceed (). A. 2mg / m3 B. 3mg / m3 C. 4mg / m3 D. 5mg / m3 Correct answer: a Six Coal mine safety regulations provisions, hydraulic flushing begins, in front of the working face should be not less than () the safety rock pillar. A. 2m B. 3M C. 4m D. 5m Correct answer: a Seven The national standard stipulates that Portland cement is not less than 60%. A. 45min B. 50min C. 55min D. 60min Correct answer: a Eight The rock area in the semi coal rock roadway is the section area of the roadway A. is greater than 1 / 5, less than 2 / 5 B. is greater than 1 / 5, less than 3 / 5 C. is greater than 1 / 5, less than 4 / 5 D. is greater than 2 / 5, less than 4 / 5 Correct answer: a Nine The effective use period of Rock Ammonium TNT explosives is () months. A. 2 B. 4 C. 6 D. 8 Correct answer: a Ten Because the cross section of coal mine tunnel is smaller, the nozzle is usually used. A. handheld B. mechanical C. fixed type D. removable Correct answer: a 15 spring term roadway driving and