多项选择题
The basis of decline curve analysis is that future production continues to follow the past trend, we can use these models to estimate ( ). A. original gas in place B. ultimate gas reserves C. remaining productive life D. formation permeability E. skin factor
单项选择题 超急排斥主要由下列哪种因素引起()
单项选择题 RC正弦波振荡器可产生幅值连续可调和频率可调的正弦波。 A、正确 B、错误
单项选择题 通过激活补体参与移植排斥的抗体主要是()