Current location - Plastic Surgery and Aesthetics Network - Wedding supplies - (2005? Huanggang) In the safety education activities, the fire police introduced the use of the dry powder fire extinguisher in Figure A, and the pointer of the barometer in Figure B is _
(2005? Huanggang) In the safety education activities, the fire police introduced the use of the dry powder fire extinguisher in Figure A, and the pointer of the barometer in Figure B is _
The indicator number of the barometer in Figure B is 1.2Mpa. When using, press the connecting rod A at the top of the valve with the handle, and the power arm is larger than the resistance arm, which is more labor-saving than pressing directly by hand. The handle is equivalent to a labor-saving lever.

If dry ice (solid carbon dioxide) powder is sprayed, it will sublimate into gas at room temperature, and the sublimation will absorb heat and have a cooling effect.

Therefore, the answer is:1.2mpa; ; Save effort; Sublimation; It sucks.