Tip 1: Be sure to make the wall waterproof, and make the wall waterproof before laying the wall tiles. Generally, the wall surface should be waterproofed to a height of 30 cm, but the non-load-bearing light-weight wall should be waterproofed at least 60 cm. Tip 2: The joint between the wall a ...read more...
According to the report of the Physicist Organization Network on January 8 (Beijing time), recently, a chemist at the University of California, Davis, has genetically engineered cyanobacteria to produce butanediol, which is a kind of Pre-chemicals used to mak ...read more...
In the early 1980s, vacuum tubes were used in China. At present, explosion-proof electrical equipment type vacuum switches have been widely used underground. The use of vacuum tubes plays a very important role in coal mines and downhole safety power supply. For example, the mine explosion-proof vac ...read more...
The keel is a skeleton fossil of ancient mammals such as elephants, rhinos, and three-toed horses. Recently, it has been found that individual medicines are commercially weathered animal bones outsourced with talcum powder or charcoal powder. The authentic keel is divided into three types: ke ...read more...
1 Overview The PL-1200 vertical shaft sand crusher is the key equipment for the concrete mixing system. The vertical shaft rotor of the pulverizer transmits the gravity of the entire rotating part to the vertical shaft rotor through the transmission system, and all the gravity of the rotating part ...read more...
Abstract On the 8th local time, the World Economic Forum released the "2013 Global Risk Report", indicating that the world faces further economic shocks, and countries need to attach great importance to the ability to withstand global risks. Among them, "increased income gap&qu ...read more...
Abstract First, the first is to strengthen operational monitoring and improve coordination of factors. In response to the current severe economic situation, we will further strengthen the monitoring and analysis of enterprises above designated size, key industries and key enterprises in the c ...read more...