【单选题】在潜油电泵机组卡阻处理中,卡阻点以上管柱和电缆处理打捞干净后,大排量正循环冲砂,必要时用()冲砂,使卡阻点以上沉砂冲洗干净。
【单选题】In the 18th and 19th centuries, scientists who set out with military expedition were to _____.
A.
make scientific discoveries
B.
spread scientific knowledge
C.
participate in science conference
【多选题】甲公司从农业银行借入3年期的长期借款50万,分录如下()