既然铁氟龙以及聚乙烯之导管内径比金属导体的外径大出许多，因此金属导体仅接触到单一的导管，导体几乎受到空气完美隔离。
Since the inner diameter of the Teflon and PE tubes is much larger than the outer diameter of the metal conductor, the metal only touches the tubes in a single line.
清管和测径用的清管器直径通常比管道内径要过盈5%至8%。
Pigging and caliper with clear pig diameter than pipe diameter usually to interference by 5% to 8%.
第二个孔内径有一个比第一口大。
The second orifice has an inner diameter larger than that of the first orifice.
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