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。