【单选题】Why is the word“different”in italics? 查看材料
A.
Because it is not important
B.
To make it easier to read
C.
To make it clear to see
【简答题】Why the author use the word 'stole' in Paragraph 5?
【简答题】化工管路的连接方法,常用的有( )A. 螺纹连接 B. 法兰连接 C. 轴承连接和焊接 D. A.B.C均可
【单选题】化工管路的连接方法,常用的有() A、螺纹连接; B、法兰连接;