（）是指地下水位下降一个单位深度，从地下水位延伸到地表面的单位水平面积岩石柱体，在重力作用下释出的水的体积。
参考答案：给水度
I was very busy that day. Otherwise I _________in the discussion. [ ]
A. would take party
B. had taken part
C. took part
D. would have taken part
经常项目中最重要的项目为（）
A.商品的进出口
B.劳务
C.投资收益
D.单方面转移
