1, this workshop is mainly for charging, which makes the positive and negative electrodes of the battery react and has an unprotected effect on the body; The cutting and stacking workshop is dedicated to cutting and polishing hard steel. As long as it is operated properly, it has no effect on the body.

2. There are some hidden dangerous substances in the chemical workshop, such as gas, hydrogen sulfide, coal tar, sodium hydroxide, sulfuric acid, sulfur, crude benzene, washing oil, naphthalene, ammonia water, hydrogen cyanide, compressed nitrogen and compressed air. It is difficult to protect. Only when cutting and grinding, the cutting workshop produces a paste smell, which has no effect on the body.