【单选题】If you want to turn on the recorder, _______ the green button.
【单选题】油气分离效果好的标准是
A.
气相收率高、液相收率低,气相密度大、液相密度小
B.
气相收率高、液相收率低,气相密度小、液相密度小
C.
气相收率低、液相收率高,气相密度小、液相密度大
D.
气相收率低、液相收率高,气相密度小、液相密度小
【单选题】—Where the recorder? I Can’t see it anywhere . —I it right here . But now it’s gone .
A.
. did you put ; haveput
C.
. had you put ; wasputting
D.
. wereyou putting ; have put
【单选题】I can’t fin the recorder in the room, It by somebody.
D.
should have been taken