在改善水、油流度比,扩大水驱波及体积方面,()主要有两个作用:一是绕流作用;二是调剖作用。
A、碱水驱油
B、表面活性剂驱油
C、三元复合驱油
D、聚合物驱油
参考答案:D
设(a2-2ab2+ab)÷M=a,则M=______.
The best job is ____which uses your skill in doing something with your interest in the subject.
A.that
B.the one
C.one
D.it