The stairs head office standard according to the design of factory building is the staircase has a slope is too much, and the width of the stairs too narrow. (the width of the steps cm > 25 height each step does not exceed 17 cm.).At present, the EN-Fac. Preparation and Investment contractors to plan. To change the ladder with safety andThrough building standard law
การแปล กรุณารอสักครู่..