笛卡(ka)兒坐標系分為左(zuo)手(shou)(shou)(shou)(shou)系和右(you)(you)手(shou)(shou)(shou)(shou)系。配管設(she)計柔(rou)性分析采(cai)用(yong)右(you)(you)手(shou)(shou)(shou)(shou)系，右(you)(you)手(shou)(shou)(shou)(shou)坐標系這名(ming)詞是由右(you)(you)手(shou)(shou)(shou)(shou)定則(ze)而(er)來的。先將(jiang)右(you)(you)手(shou)(shou)(shou)(shou)的手(shou)(shou)(shou)(shou)掌與手(shou)(shou)(shou)(shou)指伸直，然后，將(jiang)中指豎(shu)起與食指呈直角關(guan)系，再(zai)將(jiang)大(da)拇指往上指去，與中指、食指都呈直角關(guan)系，則(ze)大(da)拇指、食指、與中指分別表示(shi)(shi)了右(you)(you)手(shou)(shou)(shou)(shou)坐標系的X軸(zhou)，Y軸(zhou)，與Z軸(zhou)，如圖(tu)17.3所示(shi)(shi)。同樣(yang)，用(yong)左(zuo)手(shou)(shou)(shou)(shou)也可以表示(shi)(shi)出(chu)左(zuo)手(shou)(shou)(shou)(shou)系。