Accurate measurement of angles is important in drafting 在画图时，准确测量角的度数是非常重要的。
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The anatomical measurement of angles of zygapophysial joints on lumbosacral vertebrae and its clinical significance 腰骶椎关节突关节角的解剖学测量及其意义
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A linear filter is adopted in the system to obviate the measurement of angle acceleration and to achieve the closed - loop speed control 系统实现时，构造了一个线性滤波器以避免转子角加速度的测量，同时实现了转速的闭环跟踪。
