One of the weaker areas of Delphi are the grids (eg TStringGrid) where, although it does a good basic job, it becomes harder when you need to print it or customise its appearance. I\'ve used it for ab
莫松朝 开发者_开发问答 2022-03-19 21:33 要看氮气纯度、压力、输送方式。工业氮与高纯氮价差很大；压力高低也有区别；管道输送和瓶装气体区别很大。最便宜的管道输送工业氮只要几毛钱一立方米，最贵的瓶装超高
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