Zhaoqing elevator property charging standard

First, the fire is easy to cause power failure, and it is wrong to escape by elevator because you may be trapped in the elevator.

B. White vinegar contains acetic acid, and the main component of scale is calcium carbonate. The reaction between acetic acid and calcium carbonate can produce soluble calcium acetate, water and carbon dioxide, so it is correct.

C, in order to prevent electric shock, household appliances catch fire, it is correct to cut off the power supply first and then put out the fire.

D, the main component of wool is protein, which smells like burnt feathers when burning, and synthetic fibers have a special pungent smell when burning, so it is correct.

So choose a.