( )能进行脉冲焊接,减少焊接热输入,很适于薄板或对热敏感材料的焊接。
A.埋弧焊
B.焊条电弧焊
C.CO2气体保护焊
D.钨极氩弧焊
参考答案:D
下列哪种白血病在扫描电镜下细胞表面微结构以皱膜型为主()
A.急性淋巴细胞白血病
B.急性粒细胞白血病
C.多毛细胞白血病
D.急性单核细胞白血病
E.急性巨核细胞白血病
The teenage year from 13 to 19 were the most difficult time for me . They were also the best and worse years in my life . At the first, I thought I knew everything and could make decisions by yourself. However, my parents didn’t seem to think such. They always tell me what to do and how to do it. At one time , I even felt my parents couldn’t understand me so I hoped I could be freely from them. I showed them I was independent by wear strange clothes. Now I am leaving home to college. At last, I will be on my own, but I still want to have my parents to turn to whenever need help.
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