Changes the mechanical timer of Type 420B boiling sterilizer into an electronic timer and adds a display circuit so as to make its timing ocular,operation stable and maintenance easy.是什么意思_Changes the mechanical timer of Type 420B boiling sterilizer into an electronic timer and adds a display circuit so as to make its timing ocular,operation stable and maintenance easy.在线翻译_英语_读音_用法_例句