平差曲线
参考答案：根据各观测点相邻若干点标志值的平均值（趋势值）编制的坐标曲线称为平差曲线。
Environment-friendly Olympics requires Beijing to improve its environment, turning it into an ecology-friendly city.
A．eventually
B．specially
C．absolutely
D．traditionally
吸附分离装置原料罐加压可以达到（）的效果。
A.防止原料泵气蚀
B.减少物料汽化放空损失
C.氮封防止氧化
D.增加原料泵出口扬程
