beef middle casing 牛结肠衣
NSE plate chain elevator is comprised of running parts, drive, upper device, middle casing and lower device.
NSE板链式提升机由运行部件、驱动装置、上部装置、中部机壳、下部装置组成。
NE series plate chain bucket elevator is composed of upper section middle casing lower section moving members driving unit maintenance platform and hanging racks.
提升机由上部区段、中部机壳、下部区段、运行部件、驱动装置、检修平台和吊架组成。
With the oilfields entering into the middle and later stages of development, the casing-damaged wells increase greatly.
随着油田开发进入中、后期，套损井越来越多。
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