并着重叙述了国内外近年来采用的各种智能清管器的检测技术。
Especially the inspection technique of various kind of intelligent pigs used both in domestic and abroad in present years is described and emphasized.
超声波智能清管器进行在线管道壁腐蚀缺陷检测时，经常出现误差问题。
Error usually occurs during inspection of on-line pipelines for wall-loss defects using intelligent pig.
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