It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
显然，22毫米外径管的成椭圆形
的且难以测量。
It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
显然，22毫米外径管的成椭圆形的且难以测量。
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