Roof accident emergency disposal measures (1) The mine production command center quickly understands the location, scope and casualties of the roof accident. (2) The mine production command center will issue the evacuation instructions according to the disaster situation; notify the rescue team an ...READING MORE...
Production excavation Safety measures for working surface grinding I. Overview of the working surface (with a schematic diagram of the working surface) Second, the construction method Tilt length 2. According to the actual situation, the adjustment ratio Third, safety technical measures 1. Ch ...READING MORE...
With the rapid development of agriculture, modern pest control work has begun to shift quietly. The past has relied heavily on the prevention and control of chemical pesticides, and it is moving in the direction of green prevention and control. One of the important changes is that pest c ...READING MORE...
What is the heat flow pattern in the drying oven? Answer: There are two main types of hot air flow in the drying oven: (1) Natural convection. The natural circulation convection of hot and cold air is used to make the temperature inside the box uniform. After the electric furnace wire is energized ...READING MORE...
On the second day after the NDRC announced the ratio of shares to the opening time period, on the morning of Wednesday, April 18th, the collectives of Chinese automobile stocks plummeted and the A shares of GAC dipped to a stop. The Hong Kong stocks of Beijing Automobiles fell by 15.23%, GAC Group ...READING MORE...
1. What is the task of relay protection in the power system? When a protected power system component fails, the relay protection device of the component should promptly and accurately issue a trip command to the circuit breaker that has been removed from the faulty component, so that the fault co ...READING MORE...
The application of greenhouses in modern agricultural production is widespread and very popular with farmers' friends. Compared with open field cultivation, greenhouses have the advantage of small environmental impact, good manual controllability, production free from seasonal restri ...READING MORE...