狠狠干2017欧美最新,国产精品扒开腿做爽爽爽A片小,亚洲日韩中文字幕A∨,国产人妻丰满熟妇嗷嗷叫

The safety of ventilation engineering is related to the safety of labor. It is also directly related to the safety after the end of the project. The following is a brief introduction to the common sense of ventilation equipment installation!

1. The construction personnel shall comply with the laws and regulations of the relevant countries and the labor discipline of the enterprise in the operation, the safety helmet shall be in place, and a series of violations of operations such as slippers, red back, smoking, beating, and drinking operations shall be prohibited;

2. Before the hoisting, check the integrity of the equipment, no problem, and the hoisting commander and the guardian next to it are essential;

3. The equipment is far away from the installation site. Pay attention to safety during transportation. No one is allowed.