Certificate of occupational health and safety management system

Sunken ship salvage in underwater salvage: six different methods can be adopted according to the size of sunken ship and the specific location of the event. However, various methods can be used alone,

What is the treatment principle of sunken ship salvage underwater engineering? The basic principle of underwater engineering is chemical grouting. Chemical grouting is to inject the pressure polymer m

Underwater fishing is dangerous, so it is very necessary to make preparations in advance. Before underwater fishing, please use lifting tools to prepare in advance. Next, follow Xiaobian to understand