The stair angle is between 20 degrees and 45 degrees, and the comfortable slope is 26, 34, that is, the height-width ratio 1: 2.

Determination of the number of stairs 1 public * * * Stairs and corridor-style houses should generally take two stairs.

Must be a double staircase. The art gallery belongs to the public visiting building, and it must have double fire exits, and two stairs are necessary.