It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
显
，22
外径管的成椭圆形是最小的且难以测量。
It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
显，22外径管的成椭圆形是最小的且难以测量。
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