Subway safety attracts attention to multiple protection sites

Xi'an: To build an emergency management system for the subway early warning and monitoring system, it is necessary to focus on solving the weak links and common problems in response to unexpected public events. Xi'an will build an early warning informa.......

Pump out of water causes

Analysis of the reasons: there is air in the pump body or inlet gas, or the bottom valve is not strict irrigation water is not satisfied with the vacuum pump filling a serious leak, gate valve or beat the door closed lax. Solution: First water pressure, and then filled with water pump, and then.......

Summer sow nutrition and management

In summer, lactating sows have low feed intake, and the milk needed for fast growth of piglets will not decrease. It is necessary to reduce the difference between nutrient intake and demand by increasing the nutrient concentration of feed. Otherwise, lactating sows are thin and piglets yell.......