Ch2.相对论力学：13粒子的弹性碰撞

<p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal"><img data-key="0" alt="" src="http://imagev2.xmcdn.com/storages/c516-audiofreehighqps/E6/8C/CMCoOR8DXU-TABKYgQBdP_gh.JPG!op_type=4&amp;device_type=ios&amp;upload_type=attachment&amp;name=mobile_large" data-origin="http://imagev2.xmcdn.com/storages/c516-audiofreehighqps/E6/8C/CMCoOR8DXU-TABKYgQBdP_gh.JPG?op_type=0" data-preview-height="85.96736596736596" data-preview-width="140" data-preview="http://imagev2.xmcdn.com/storages/c516-audiofreehighqps/E6/8C/CMCoOR8DXU-TABKYgQBdP_gh.JPG!op_type=4&amp;device_type=ios&amp;upload_type=attachment&amp;name=mobile_small" data-large-height="460.5394605394605" data-large-width="750" data-large="http://imagev2.xmcdn.com/storages/c516-audiofreehighqps/E6/8C/CMCoOR8DXU-TABKYgQBdP_gh.JPG!op_type=4&amp;device_type=ios&amp;upload_type=attachment&amp;name=mobile_large" /><br /></p>