问题
单项选择题
进行氧乙炔焊接时,火焰在火咀接头燃烧,原因是()
A.火咀温度过高
B.火咀没有锁紧
C.乙炔量过多
D.以上皆是
答案
参考答案:B
进行氧乙炔焊接时,火焰在火咀接头燃烧,原因是()
A.火咀温度过高
B.火咀没有锁紧
C.乙炔量过多
D.以上皆是
参考答案:B
根据短文内容,用方框中所给词语的适当形式填空,使文意通顺、完整。
Mr Cooper is a (77)__________. He sings very well. Mrs Cooper is a (78)__________. Her daughter studies at her school. Mrs Cooper likes Beijing Opera very much. She thinks she can learn about Chinese (79)__________ and culture. So she often goes to see Beijing opera. (80)__________ her daughter doesn’t think so. She likes (81)__________, and her favorite movie is Mr Bean. Mr Cooper doesn’t like movies. He thinks they are (82)__________. He likes sports. His favorite sport is (83)__________. He likes Yao Ming very much. The Coopers want to go to Pingyao, Shanxi. It is an (84)__________ and nice place. They want to take photos there. They can also (85)__________ to speak Chinese. They can have a good time in China. |