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Bill Gates, co-founder and former CEO of Microsoft, and his wife, Melinda French Gates, announced on Monday that they plan to divorce after 27 years of marriage. "After a great deal of thought and a lot of work on our relationship, we have made ...…
There are many types of cement, such as low alkali cement, ordinary cement and so on. Do you know the difference between low alkali cement and ordinary cement?…
Natural river sand has been exhausted after decades of large-scale mining, concrete production enterprises began to use machine-made sand as fine aggregate on a large scale.…
The spread of the novel coronavirus is taking a direct hit on the operations of airlines in Asia. About 500,000 flights taking off and landing in mainland China have been canceled since January, according to aviation information company Cerium. Touri…