是否能证明黑化厚度有很好的管控？
Is there an evidence that black oxide thickness is well controlled?
youdao
而在换热器设计过程中，管板厚度设计计算比较复杂。
The calculation for the tube plate thickness of heat exchanger is complex in normal design.
028个铸壁厚度管。
028 wall thickness tube.
牙体壁厚度；根管疗法；研究。
Thickness of the tooth body; Root canal therapy; Research.
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