pitchn.球场;程度;音调;推销;投掷;街头商贩摊位;沥青;树脂;松脂v.投;颠簸;搭帐篷;定调;推销;用沥青覆盖
pitch error(螺纹的)螺距误差, (齿轮的)周节误差, (啮合的)节距误差
pitch scale俯仰角度标
pitch gauge螺距规,螺纹样板
pitch blackadj.漆黑的n.漆黑
pitch block节圆柱
pitch paver沥青摊铺机
pitch wheel相互啮合的齿轮
pitch resin沥青树脂
pitch plane节平面,节面
pitch valve斜阀