六亚甲基二异氰酸酯 ( HMDI ) 可用在预聚物中代替甲苯二异氰酸酯〔TDI〕.Hexamethylene diisocyanate ( HMDI ) may be used in prepolymer, in place of TDI.柯达叙述了一种直链的活性亚甲基两当量的黄成色剂.Kodak company describes open chain reactive methylene two - equivalent yello...
The spectral analysis techniques have been applied to the gemological study and gemstone identification.波谱分析技术已被成功地应用于宝石学研究和宝石鉴定领域.The gemstone is 28.6 millimetres high and weighs 139.43 carats.这块宝石高28.6毫米,重139.43克拉。He b...
士兵们还在用仿制的武器,因为还搞不到真家伙。Soldiers were still using dummy weapons because real guns were not yet available.保密纸: 有著难以仿制的特徵, 如水印等的纸张.Security paper: Paper incorporating features, such as water marks , etc. which make counterfe...