<span style、"font-family: 宋体; font-size: small;"><span>机械式</span></span>
<span style、"font-family: 宋体; font-size: small;"><span>平行式</span></span>
<span style、"font-family: 宋体; font-size: small;"><span>有机式</span></span>
<span style、"font-family: 宋体; font-size: small;"><span>直线式</span></span>