Common quality problem occurred in China made steel pipe mainly involved in surface quality, dimension deviation, chemical composition, mechanical properties and quality inspection, etc.

国产钢管常见的质量问题主要表现在表面质量、尺寸偏差、化学成分、力学性能和质检等方面。

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After modified design, the M-827 measuring rule used to measure step diameter can measure the actual dimension deviation of machined parts directly and quality of the parts is improved too.

改进设计的M—827止口直径测量尺能够直接测量出被加工零件的实际加工尺寸偏差，提高零件加工质量。

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There is an enormous average difference between women and men in this dimension, about one standard deviation.

在有一定偏差的前提下，两性有巨大差异。

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