螺杆泵抽油井停泵一天以上时,对于稠油井、出砂井,应()处理。
A.上提抽油杆进行洗井
B.立即开井
C.立即洗井
D.起出螺杆泵
参考答案:A
There is no important information in the newspaper, _______?
A. isn’t there B. is there C. is it
加入哪种物质有利于气泡逸散,还能改善胶剂的气味()
A.冰糖
B.油类
C.酒类
D.明矾
E.阿胶