He was so helpful that we ____ him as direct.[ ]
A. chose
B. found
C. elected
D. put
答案:C
一长方形金属块置于水平桌面上,若沿水平线切去一半,则剩余部分对桌面的压力______,压强_______;若沿竖直方向切去1/2,则剩余部分对桌面的压力______,压强_______。(填“增大”“减小”或“不变”)
加味圣愈汤功效与作用