According to the data in China Statistical Yearbook from 1992 to 2008,by using regression model,we adopt least square method and generalized least square method
The Al-Mg-Mn-Zr-Er alloy sheets with a thickness of 4 mm were welded by TIG welding, the microstructures and mechanical properties of Al-Mg-Mn-Zr-Er alloy weld
1. Make sure you use sunscreen (防晒霜) when you go to the beach. Using sunscreen will help protect (保护) your skin. 2. Many people use this bank because it’s convenient (方便). 3. She uses a shopping ba