Masks are lacking under the epidemic, and 3D printers can produce masks to protect the epidemic. It is reported that to respond to the epidemic, the US Air Force's 388th Fighter Wing enabled 3D printing technology to make N95 masks.…
The Standing Committee of the National Wildlife Commission (SCNBWL) is planning to make policy decisions on land management of protected areas and timber under the power transmission line. Considering that this is a policy issue following the Supreme…
Althoughthe era of full-screen has arrived, due to the existence of the front cameramakes the screen can not be displayed in full, cell phone manufacturers have tomake a variety of holes in the screen. With the advancement of technology, theunder-scr…
If the compatibility of polycarboxylate superplasticizer and cement is not good, the concrete mixture is prone to some problems, such as segregation, bleeding, greater slump loss, shorter setting time and so on, so that the concrete mixture can not b…
Many U.S. states are preparing to end their participation in the federal unemployment program, which will affect sales of straight lace front wigs, as well as the cost and price of straight lace front wigs Many U.S. states are preparing to end their…
Aluminum nitride is synthesized by carbothermal reduction of alumina or by direct nitridation of aluminum. Aluminum nitride density is 3.26g/cm3. Although it does not melt, it decomposes above 2500°C at atmospheric pressure.Aluminum nitride is co…