... internal diameter 内径 Outside diameter of pipe 管外径 gas density/density of the gas 气体密度 ...
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To guarantee the inside diameter of a pipe or other cylindrical tool by pulling a cylinder or pipe (rabbit) of known outside diameter through it.
确保管子或其它圆柱形工具的内径合适，通过拖动已知外径的圆柱体或管子(清管器)穿行其中。
The Out-of-roundness is not more than 2% of the outside diameter of the pipe at any point.
弯管圆度应保证弯管上任何一点的外部直径不得大于标准直径的 2%。
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