如何提高VD结束钢液温度的命中率?
参考答案:
了解钢包周转情况和透气砖情况;了解钢渣流动性和吹氩的流量压力等;了结钢包炉升温情况及VD操作温降情况。
-What are you doing for your vacation?
-I _______my little sister at home. My mother is very busy.[ ]
A. am look after
B. am looking for
C. am babysitting
D. am babysit
胸片上,正常肺门位于()
A.第1~3前肋内带
B.第2~4前肋内带
C.第4~6前肋内带
D.第5~7前肋内带
E.第7~9前肋内带