All the guests disliked the salted fish. They 　　　 this dish 　　　. 

A．left; untouched

B．left; on the table

C．took; as bad

D．kept; covered

尽管采出液中聚合物浓度增大，但在一定抽吸参数条件下，对（）基本没有影响。

A、无游梁式抽油机井

B、游梁式抽油机井

C、电动潜油泵井

D、螺杆泵井