奥氏体不锈钢与珠光体耐热钢焊接时，应采用较大的坡口角度，以减少熔合比。( )
参考答案：对
Linda's teacher was so mad _____ her because she made lots of mistakes in the test. [ ]
A. at
B. in
C. on
D. about
焊接裂纹
