The trial is divided into 4 1. workers sit on the floor and parallel arm, keyboard, keyboard tray, with a smooth paste. 2. workers sit on the floor, arms parallel and angle 8 degrees to the keyboard handling keyboard 3. adjust the height of the keyboard tray, height 62 cm and a child tray with plain paste, keyboard, keyboard, 4. a worker sitting garden using worker number 10 and 8 minutes in each trial.
การแปล กรุณารอสักครู่..
