焊接电弧
参考答案:
由焊接电源供给的,具有一定电压的两电极间或电极与焊件间,在气体介质中产生的强烈而持久的放电现象。
连词成句。
1. my, favorite, Jacket Chan, movie, is, star
2. give , letter ,this , please, to, Maria
3. are ,what, grade, Li Ming and Li Lei, in
4. are ,in , the , school, we, same, but, grades , in, different
5. both ,black, eyes, they, have ,black, and ,hair
()操舵时,船舶返回正航向过程中必须操回舵。
A.自适应
B.自动
C.随动
D.单动