理气药对胃肠运动具有（）作用．
参考答案：调节
A．5 V/m，沿x轴正方向
B．25 V/m，沿y轴负方向
C．500 V/m，沿y轴正方向
D．V/m，沿x轴负方向
The young man used to to work, but he is used to to work now.
A. drive; walking B. drove; walked C. driving; walk
V/m，沿x轴负方向