井架移到位且不再调节井口后（）收回，固定井架底座，井架底座滑道盖盖板，清理控制台卫生，爬行爪销子保养。
参考答案：液压缸
I could tell he was surprised from the ________ on his face.
A．appearance
B．view
C．sight
D．expression
短航线只需要发放意见卡，无需发放金鹏卡。
