当测试管柱的封隔器及其以下钻具遇卡时,用震击器不能解卡,此时应倒开()起出上部测试工具及钻具。
A、震击器
B、安全接头
C、MFE
D、液压锁紧接头
参考答案:B
— Shall we go hiking on the weekend?
— . The weather report says it will rain heavily. [ ]
A. I'm afraid we can't
B. I'd love to
C. That's a good idea
D. That's all right
A.CH3-CH=CH2与
B.
C.HCOOC2H5与CH3COOCH3
D.