弹性气驱油藏开采到一定阶段就会转化为（）
A.溶解气驱
B.弹性水驱
C.气顶驱
D.各种驱动的综合
参考答案：A
.
He made a big mistake, and _________, he lost his job.
A．as a result
B．as soon as
C．in case
D．even if
振动式给煤机由哪些部件组成？
