SCD developed the first vacuum etching machine in china,with vacuum flood bar in the etching chamber;no pool effect;etching factor is up to 4.0.是什么意思_SCD developed the first vacuum etching machine in china,with vacuum flood bar in the etching chamber;no pool effect;etching factor is up to 4.0.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句