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

东北大学15春学期《井巷掘进与施工》在线作业2（Northeastern University 15 spring term roadway driving and construction online homework 2） 15 spring term roadway driving and construction online homework 2 First, radio questions (6 questions, 30 points) One A large main pass must be made in the lower middle () so as to install temporary rock fill funnel in the chamber. A. cuts the ore gate chamber; B. cuts the pavement; C. cuts out the mucking well; D. cuts out the mucking well A. B. C. D. Correct answer: a Two The thickness of a single jet should not be less than twice the maximum particle size of the aggregate to reduce springback. A.2; B. 3; C. 4; D. 5 A. B. C. D. Correct answer: a Three In the rock blasting with lifting tank method, it is the first detonating hole, the blasting condition is the worst, and its charge is more than other holes. A. drilling chamber; B. cut hole; C. peripheral hole; D. center hole A. B. C. D. Correct answer: a Four (a) a complete set of switches temporarily installed on the original track, which is simple in structure and movable, and can be designed and processed on the spot. A. diamond float switch; B. float switch; C. symmetrical floating switch; D. buckle type float switch A. B. C. D. Correct answer: a Five Cutting deep hole tunneling can be divided into with the air holes for free surface cutting and cutting for the free surface (). A. charging hole; B. cut face; C. rock face; D. patio face A. B. C. D. Correct answer: a Six The shed leg is the fulcrum of the top beam, and the angle between the leg and the bottom plate is generally (), and should be inserted into the solid bottom rock. A.65 degrees; B. 60 degrees; C. 80 degrees; D. 75 degrees A. B. C. D. Correct answer: a 15 spring term roadway driving and construction online homework 2 Two, (a total of 6 multiple-choice questions, a total of 30 points.) One The courtyard is divided into (). A. person walk courtyard, material patio B. explore the patio and fill the patio C. cut patio, ventilation patio D