“Drive-ins” have large parking lots _____ customers are served in their cars by waitress.

A．who

B．when

C．which

D．where

井口生产出的油气混合物经分离器计量后，气又回到输油管线，在同一条管线内油气混合输至集油站的输油方式称为（）。

A.油气分输流程

B.油气混输流程

C.集中计量流程

D.单井计量流程