本题目来源于试卷: Physics Unit11: Vibrations and Waves，类别为 国际高中通用物理
[单选题]
In seismology, the Pov g-8uenblrz2o//qtc ii/y, : e*+uqk6hjc4w 0g3fn.w/+lwl+s yxd wave is a longitudinal wave. As a P wave travels through the Earth, the relative motion between the P w 43cw+xf 0jd/n lw6wsylhk+ g.ave and the particles is
A. parallel.
B. perpendicular.
C. first parallel, then perpendicular.
D. first perpendicular, then parallel.
参考答案: A
本题详细解析:
暂无
| 
