气井分析的目的是什么？
参考答案：
目的是为了管好气井及地面设备，充分发挥气层的生产能力，保持气井稳产、高产，提高气藏采收率。
With more forests being destroyed, huge quantities of good earth each year. [ ]
A. is washing away
B. is being washed away
C. are washing away
D. are being washed away
要使20℃接近饱和的硝酸钾溶液变为饱和溶液，下列做法中正确的是 [ ]
A．加入少量硝酸钾固体
B．加入少量水
C．升高溶液温度
D．倒出少量的溶液
