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Various crystal forms of alumina (α, β, γ, δ, θ, etc.) have been found, among which γ-Al2O3 is also called active alumina.…

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Air bubbles in concrete: Why and How to deal with it?

The bubbles in concrete above 100μm are called large harmful bubbles, 100 ~ 50μm are called harmful bubbles, 50 ~ 20μm are called low harmful bubbles or harmless bubbles, and those below 20μm are called beneficial bubbles.…

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Analysis of market opportunities for human hair wigs and hair extensions in 2021 for examples of straight lace front wigs

The UK female wigs, wigs and hair extensions market was valued at US$612.9 million in 2019 and is expected to reach US$1.1815 million by 2027, with a compound annual growth rate of 11.7% from 2021 to 2027. In 2019, the wig market occupies Has gained…

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