随着聚合物注入量的增加。采液指数不会持续下降。逐新趋于一个稳定值。
参考答案:对
You ________ come tomorrow. I can do it myself. [ ]
A. needn't
B. mustn't
C. can't
D. shouldn't
若正比例函数的图象经过点(-1,2),则这个图象必经过点( )
A.(1,2)
B.(-1,-2)
C.(1,-2)
D.(2,-1)