通过解读文献来分析煤气的生产、净化、储存和传输，以及煤气灯的形制等方面的理论和技术内容。
Through all these literature, the author analyses many important links of the coal gas production, the purification, the storage, the transmission as well as the gas lamp production at that time.
手术室产品系列：麻醉机、麻醉监护仪、高频电外科手术器、手术无影灯、手术床、手术室吊塔、净化系统；
Operating Room Products: Anesthetic Machine, Anesthetic Monitor, High-Frequency Surgical Instruments, Shadowless Lamp, Operation Table, Purification System.
紫外线消毒灯是一种低压汞蒸汽放电灯，广泛应用于污水处理和净化中。
Ultraviolet lamps are a type of low pressure mercury vapor discharge lamps, which belong to special type fluorescent lamps and are widely applied in sewage disposal and water purification.
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