化学清蜡
参考答案：
利用在井下化学反应清除井眼内、井底或射孔炮跟附近油层内部沉积蜡的方法。
To our joy, only a small number of people voted against it, and the majority were it.
A．in honor of
B．in place of
C．in favor of
D．in memory of
单位质量液体通过泵获得能量的大小称为泵的（）.
A.流量
B.扬程
C.效率
D.功率
