[多选题]不锈钢熔化极脉冲氩弧焊操作要点包括( )。
A.焊枪角度与焊接工艺
B.试板位置及组对
C.熔滴过渡形式
D.操作姿势

When I was walking down the street the other day, I happened to notice a small brown leather wallet lying on the side walk. I picked it up and opened it to see if I could find out the owner’ s name. There was nothing inside it except some change and an old photograph -- a picture of a woman and a young girl about twelve years old, who looked like the woman’ s daughter. I put the photograph back and took the wallet to the police station, where I handed it to the desk sergeant. Be fore I left, the sergeant took down my name and address in case the owner might want to write and thank me.
That evening I went to have dinner with my aunt and uncle. They had also invited a young woman so that there would be four people at the table. Her face was familiar, I was quite sure that we had not met before, but I couldn’t remember where I had seen her. In the course of conversation, however, the young woman happened to mention that she had lost her wallet that
A. amazed
B. disappointed
C. sad
D. happy