What do the following safety signs mean? The shape of an equilateral triangle with a wide black border around the yellow bottom.

What do the following safety signs mean? (b) The shape of an equilateral triangle, with a wide black frame around the yellow bottom and a black skull and bone painted on it.

A. the danger of death B. beware of poisoning C. the danger of nuclear radiation.

Safety warning signs are divided into the following categories according to their different meanings:

1, no sign. Usually, some people's behaviors are prohibited or stopped, including prohibiting flammable materials, smoking, traffic, fireworks, fire fighting with water, etc.

2. Warning signal. Warn people of possible dangers, including safety, electric shock, explosion, fire, corrosion, poisoning, etc.

3. Description tag. Must abide by, including wearing protective shoes, wearing seat belts, wearing protective glasses, wearing gas masks, etc.

4. Prompt signs. Indicate the direction of the target, including safe passage, emergency exit, etc. ; Fire fighting equipment warning signs, etc. ;

5. Supplementary signs are supplementary descriptions of the above four signs to prevent misunderstanding.

According to GB2893-82, safety color is the color that expresses the meaning of safety information, which is divided into four colors: red, yellow, blue and green. Its meaning and use:

(1) Red: indicates prohibition, stop and fire prevention. Purpose: No sign signal.

(2) Blue: indicates the regulations that the instruction must abide by. Purpose: Indicating sign.

(3) Yellow: indicates warning attention. Usage: warning sign, warning sign.

(4) Green: indicates that the prompt is safe. Usage: Indicating safety protection equipment such as vehicle safety passage, pedestrian traffic sign and fire fighting equipment.

(5) Red and white spacing stripes: indicating that crossing is prohibited. Usage: protective fence on the road.

(6) Interval stripes of yellow and black: indicating warning danger. Uses: internal protective fence of enterprises, hook and pulley frame of crane on construction site, fence laid outside dangerous parts.