湖泊、水库取样位置可以采用以建设项目的排放口为中心,沿( )布设的方法。
A.南北向 B.放射线C.同心圆 D.东西向
参考答案:B
He wanted to know _______
A.why he bought the present for
B.which room he lived in the hotel
C.who he had travelled with
D.who has been chosen to be the chairperson
表面活性剂在储油岩层的滞留机理之一是,微孔液失去()能力。
A、吸附
B、流动
C、分散
D、活化