Under the spread of the new crown epidemic, after Americans experienced life and death, they set off the largest "resignation wave" in history, and the number of resignations broke the highest record since statistics began in 2000. Since April this y…
Diamonds are forever, Gold is precious but which is rarer? Gold is a heavy metal formed during the collision of neutron stars and is one of the rarest elements on Earth.During the formation of the earth, heavy elements gradually accumulated towards t…
It can be regarded as a multi-phase material, including graphite phase transformed from carbonaceous particles such as petroleum coke or pitch coke, graphite phase transformed from coal tar binder surrounding the particles, particle accumulation or c…
Recently, international crude oil futures ushered in a surge. As of the close of April 14, the price of light crude oil futures for delivery in May on the New York Mercantile Exchange rose 2.97 US dollars to close at US$63.15 per barrel, an increase…
Description ofConcrete strength and shrinkage reducer1. After the carbonate cement is added to the c...…