在油层套管进行磨、铣处理时,尽量避免油气层段套管磨损,一旦发现套管磨穿,应采取相应的措施()。
A、快速起下钻
B、关井
C、压死油气层
D、压稳油气层
参考答案:D
Nine in ten parents said there were significant differences in their approach to educating their children compared with ______ of their parents.
A.those B one C.both D.that
一揽子社会保障预算的缺点包括( )。
A.政府参与过多
B.涉及部门利益的重新调整,实施难度很大
C.具体编制方法比较复杂
D.容易使社会保障预算的编制流于形式
E.受到福利刚性的影响,易于给财政造成较大负担