Recently, covid 19 outbreak spreads in Shanghai, China. There are more than 25,000 new asymptomatic domestic infections every day. China is implementing a dynamic zero-out policy. A leading respiratory expert said the key to COVID-19 prevention and c…
Before construction, ensure that all kinds of instruments used during construction can operate normally, check their status and break the work, and the materials must be in place.…
According to the different molecular structure, it can be divided into four generations of polycarboxylate series superplasticizer, the first generation is acrylic acid copolymer, the second generation is propylene ether type, the third generation is…
Ni-Ti alloy, also known as Nitinol, is a metallic alloy of nickel and titanium in which the two elements are present in roughly equal atomic percentages.…
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