Answers: A, C, D, E
The advantage of slant-eye cutting is that it is easy to throw the rocks within the cutting range outward, and the number of cutting eyes required is small. ; The disadvantages are that it is difficult to control the drilling direction, the depth of the blast hole is limited by the width and height of the tunnel, and the gravel throwing distance is large. The advantages of straight hole cutting are simple layout of the working surface, easy mechanization of drilling, and high blast hole utilization. Medium and deep hole blasting can be achieved by adjusting the amount of explosives, and the blast piles are concentrated. The disadvantages are the large number of blast holes and the large amount of explosives. , the blast hole spacing and parallelism have a great influence on the undercutting effect. Therefore ACDE is correct.