标题（Title） 一般不超过80个字符
ac power supply,dc power supply-Preen AC Power Corp.
（53 个字符）
关键词（KeyWords）一般不超过100个字符
ac power source,ac power supply,ac source,dc power supply,programmable power supply
（83 个字符）
描述（Description）一般不超过200个字符
Preen (AC Power Corp.) is a leading provider of ac power supply, dc power supply, and programmable power supply. We also specialize in Power Electronics, ac power source, and ac source.Product Line includes AC Power Source, DC Power Supplies, Power Supplies for Defense Industry, Renewable Energy Simulators, Line Conditioners and UPS.
（335 个字符）
