When the arm of 1 hangs naturally, the armrest can hold the arm at an angle of 80- 100.

2. The back is close to the supported chair back, and there is no space: the chair and the chair back form an angle of 100- 1 10.

The distance between the head and the computer screen is 50-70 cm.

The correct sitting posture of the student party

1 Sit up straight, keep your back straight, and don't lean back.

Press the paper with your left hand, hold the pen with your right hand, and leave the desktop at the same time.

Eyes a foot from the book, body a punch from the table, feet naturally flat on the ground.

The driver's correct sitting posture

1 The height between the head and the roof is appropriate: the head is more than one fist away from the roof, and the line of sight is in the middle and upper part of the windshield when looking up, and the front of the car can be seen;

2 arms should be bent: the back of the body is close to the seat, the hands naturally stretch forward, and the wrists of both hands are just on the upper edge of the steering wheel, so that the joints can still be bent;

3 legs should be bent: after the brake and clutch pedal are fully depressed, the knee joint can still be bent to a certain extent;

The best distance between the steering wheel and the body: the lower edge of the steering wheel should be about a fist away from the front of the leg.