Have been in China for about 1.5 million elevators in use, and once all the elevator power outages, can’t continue to use the elevator, and the medical elevator, especially the fire lift when the elevator power, will cause the ride in the elevator passengers were put in the elev···
Expo as the world’s oldest and one of the biggest international event, is a major event in display of human civilization and progress of science and technology, is an important stage show of the latest achievements of science and technology. In one hundred, to the development of···