91嫩草国产线观看免费无码_中文字幕乱码视频日韩欧美_亚洲欧美成人在线_在线观看成人影院_色又黄又爽18禁免费网站_最新福利一区二区在线观看_国产一级黄色视频卡片_国产亚洲欧美东京日韩_国产精品无码免费视频_久久高清成人免费电影

As a national central city and Western hub, Chongqing has more than 150,000 elevators. Chongqing is known as a mountain city with many elevators. How to ensure the safety of personnel and equipment is very important. The renovation and updating of the old elevators is of great significance to eliminate the safety risk of the old elevators.

As a leading manufacturer of elevator drive and control products in China, Hpmont invites competent authorities, leaders of elevator enterprises, front-line technical experts, owners'representatives, etc. to communicate on elevator electrical system renovation and old building installation.