1. adherence to standards, control the volume of all categories. 2. volume control source to a level standard as defined by the law. Using the manufacturing process that does not use a loud. Wall tiles with noise or sound barrier materials. 3. the people who are in noisy sources should use hearing protection material, such as a loud, earplugs. The machine, ear, etc.
การแปล กรุณารอสักครู่..
