When using construction cement foam board, it's essential to pay close attention to the details. One of the key factors is ensuring the impermeability of the external insulation material while maintaining the p…
In the early 1990s, China's air pollution problem was already a growing concern. According to the "China Environmental Bulletin," urban air quality in 1997 remained at a high level of pollution, with northern cities experiencing more severe conditions compared to southern ones (see Figure 3-1).…
In the context of environmental issues, air pollution remains one of the most pressing challenges in China. According to the "China Environmental Bulletin," it was reported that in 1997, urban air quality across the country remained at a high level of pollution, with northern cities experiencin…
In all regions of China where soybeans are cultivated, blight is a common and serious issue that can lead to significant crop loss. The disease causes plants to become stunted, yellow, and eventually die, drastically reducing yield. The pathogen responsible for this blight specifically targets …
In every region of China where soybeans are cultivated, blight is a common threat that can lead to significant crop losses. This disease causes large areas of the plants to become stagnant and die, greatly reducing overall yield. The pathogen responsible for blight specifically targets soybean …
Jade has evolved significantly over the past 6,800 years, and its value has been shaped by various factors throughout history. Unlike other antiques such as calligraphy, paintings, or ceramics, jade is a natural gemstone with intrinsic worth. This value is influenced by elements like origin, co…
Jade has evolved over thousands of years, and its value has changed with time. Looking back at the history of jade development over the past 6,800 years, we can understand its significance through several key a…
In June 2012, Liu was hired as a saw operator at a wood processing factory and signed a five-year labor contract. During his time at the factory, he noticed that experienced workers in his team were provided with protective glasses and gloves. He then requested the fact…
In June 2012, Liu was hired by a wood processing factory as a saw operator and signed a five-year labor contract. During his time at the factory, he noticed that senior workers in his team were provided with protective glasses and gloves. He then requested the same from the factory, but since h…
The cross-rolling technique is extensively used in the manufacturing of alloy steel pipes. It plays a key role in several critical processes such as rolling, equalizing, sizing, stretching, expanding, and spinning, in addition to the primary operation of piercing. C…
The cross-rolling technique is extensively used in the manufacturing of alloy steel pipes. It plays a key role in several essential processes such as rolling, equalizing, sizing, stretching, expanding, and spinning, in addition to the primary process of piercing. Cu…
On April 11th, the official website of the Ministry of Industry and Information Technology released a notice titled "Target Task of Eliminating 19 Outdated Production Capacities in the Industrial Sector." Among the five key industries targeted, the non-ferrous metals sector was highlighted, wit…