奥氏体不锈钢焊接接头中σ相的产生会使焊缝的塑性大大降低,这种现象叫σ相脆化。( )
参考答案:错
0.3:1的前项扩大10倍,要使比值不变,后项也应该______,这是根据______性质.
This group of designers a plan for the project of the company.
A.drew up
B.sent up
C.set up
D.turned up