Reference values of the serving angles of the racket with different speed and height were provided.
给出以不同初速度和高度发球时球拍角度的参考值。
Objective: Measuring the secure depths and angles of Yamen acupoint with three-dimensional positioning MRI to provide the reference datas of secure depths and angles for clinic.
目的：通过使用三维定位MRI测量哑门穴进针的安全深度、角度，为临床提供安全针刺深度和角度的参考数据防止意外事故发生。
The paper shows the clear relationship between the reference planes for the nominal angles of the cutting tool and the planes for the working angles of the cutting tool.
给出了刀具标注角度参考系平面与工作角度参考系平面之间的关系式。
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