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一种保密的书写方法。用特制的不显象的药水写在纸或其它材料上，约定对方用特殊方法处理，使字形显现。一种保密的书写方法。以特制的药剂在纸上书写文字，干后纸上看不出痕迹，需以烘烤或特制化学药剂涂抹，产生化学变化，使字迹重新显现。主要目的是防止文件内容外泄。
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emulsion substance
emulsion sulfiding process
emulsion support
emulsion surface
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emulsion texture
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emulsion thickener
emulsion thickening
emulsion thickness
emulsion to base
emulsion to emulsion
emulsion track
emulsion transfer pump
emulsion treater
emulsion treatment
emulsion trough
emulsion tube
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更新时间：2025/5/25 20:06:12