Take the elevator to talk about civilization
Society's development, the high-rise buildings gradually increased, the elevator has become an essential tool.
How to save when the elevator falls Take the elevator to talk about civilization
Regardless of the number of floors, it is to quickly put the buttons on each floor are pressed.
Elevator safety knowledge quiz 1 Take the elevator to talk about civilization
Regardless of the number of floors, it is to quickly put the buttons on each floor are pressed.
Elevator safety knowledge quiz 2
Regardless of the number of floors, it is to quickly put the buttons on each floor are pressed.
Elevator safety knowledge quiz 3
What items should be paid attention to in the elevator?