【Daily Topic】【Engineering Version 20160430】
Thread Content
Participation reward: 2 Wealth. Reward for the correct answer: 9 Wealth. A certain mine is developed using a system of main and auxiliary shafts; the construction unit in charge is responsible for building a main shaft with a net diameter of 5 meters and a depth of 489 meters, with an additional 80 meters of depth in the overburden layer. What is the optimal set of mechanical equipment for carrying out the construction work? A. 2JK-3.5 hoist + JK-2.5 hoist, equipped with 2 sets of 3m3 buckets for lifting; FJD-6 umbrella drill, HZ-4 rock grab, etc. B. JKZ-2.8 hoist dedicated for drilling, equipped with 1 set of 3m3 buckets for lifting; FJD-6 umbrella drill, HZ-4 rock grab, etc. C. 2JK-3.5 hoist, equipped with 1 set of 3m3 buckets for lifting; FJD-6 umbrella drill, 1 HZ-4 rock grab, etc. D. 2JK-3.5 hoist, equipped with 1 set of 3m3 buckets for lifting; FJD-9 umbrella drill, 2 HK-4 rock grabs, etc
C. The 2JK-3.5 hoist is equipped with a 3m3 bucket for lifting; there is also an FJD-6 umbrella drill and 1 HZ-4 rock-grabbing machine
C. The 2JK-3.5 hoist is equipped with a 3m3 bucket for lifting; there is also an FJD-6 umbrella drill and 1 HZ-4 rock-grabbing machine
A.....................
A certain mine uses a system of primary and secondary shafts for development. The primary shaft for which this construction company is responsible has a net diameter of 5 meters and a depth of 489 meters; the depth of the surface soil layer is 80 meters. The optimal set of mechanical equipment for carrying out construction work in this case is (C). A. 2JK-3.5 hoist + JK-2.5 hoist, equipped with 2 sets of 3m3 buckets for lifting; FJD-6 umbrella drill, HZ-4 rock grabbing machine, etc. B. JKZ-2.8 hoist dedicated for shaft drilling, equipped with 1 set of 3m3 buckets for lifting; FJD-6 umbrella drill, HZ-4 rock grabbing machine, etc. C. 2JK-3.5 hoist, equipped with 1 set of 3m3 buckets for lifting; FJD-6 umbrella drill, 1 HZ-4 rock grabbing machine, etc. D. 2JK-3.5 hoist, equipped with 1 set of 3m3 buckets for lifting; FJD-9 umbrella drill, 2 HK-4 rock grabbing machines, etc