问题
单项选择题
氧熔剂切割时,割嘴与金属表面距离应比普通气割时稍大些,约为(),否则容易引起回火。
A、1.5~2mm
B、15~20mm
答案
参考答案:B
氧熔剂切割时,割嘴与金属表面距离应比普通气割时稍大些,约为(),否则容易引起回火。
A、1.5~2mm
B、15~20mm
参考答案:B
用方框中词的适当形式填空。(5分)
小题2: Bill is ________ than the other boys in my class. 小题3:Kobe is always ___________ in P.E. class. 小题4:Yesterday’s talent show was a great ___________. 小题5:Mozart started ___________ music at the age of four. |