The national standards for film thickness testing methods are introduced. A brief introduction is made to the testing methods of dry and wet film thickness, and service range thereof.是什么意思_The national standards for film thickness testing methods are introduced. A brief introduction is made to the testing methods of dry and wet film thickness, and service range thereof.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句