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
成椭圆形是最
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毫米外径管成椭圆形是最难以测量。
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