Jewellery: cuff bracelets and slave bangles in metallics and bright plastic. Chains with coloured gemstones.珠宝首饰. 金属或亮塑料手镯和脚链,链子上要镶有彩色宝石.From ancient times supernatural powers have been attributed by astrologers to certa...
photoelectric element光电管Training simulator system for photoelectric collimator is designed for the manual operation of photoelectric collimator.光电瞄具模拟训练器是为解决光电瞄具的使用操作而设计的.Photoelectric spectrophotometers give better resu...