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Regarding the perforation pile drilling verticality control measures, the correct ones are ()A, at the interface of soft and hard soil layers, high-speed drilling B, construction site should be compacted, leveling C, drilling rig installation

author：Two build fighting

Regarding the perforation pile drilling verticality control measures, the correct one is ()

A. At the interface of soft and hard soil layers, it should be drilled at high speed

B. The construction site should be compacted and leveled

C. When the drilling rig is installed, the slope of the drilling rig base should be consistent with the slope of the site

D. The verticality of the active drill pipe should be adjusted in time

E. Drilling at high drilling pressure at the inclined rock surface

BD

incline concerning promptly vertical control high speed
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