笛卡(ka)兒坐(zuo)標(biao)系分(fen)為左(zuo)手(shou)(shou)(shou)(shou)(shou)系和右(you)手(shou)(shou)(shou)(shou)(shou)系。配管設計柔性分(fen)析采用(yong)右(you)手(shou)(shou)(shou)(shou)(shou)系，右(you)手(shou)(shou)(shou)(shou)(shou)坐(zuo)標(biao)系這名詞是由右(you)手(shou)(shou)(shou)(shou)(shou)定則而(er)來的。先將右(you)手(shou)(shou)(shou)(shou)(shou)的手(shou)(shou)(shou)(shou)(shou)掌與(yu)(yu)手(shou)(shou)(shou)(shou)(shou)指(zhi)(zhi)(zhi)伸直，然后，將中指(zhi)(zhi)(zhi)豎起(qi)與(yu)(yu)食指(zhi)(zhi)(zhi)呈直角(jiao)關(guan)系，再(zai)將大(da)(da)拇指(zhi)(zhi)(zhi)往上指(zhi)(zhi)(zhi)去，與(yu)(yu)中指(zhi)(zhi)(zhi)、食指(zhi)(zhi)(zhi)都呈直角(jiao)關(guan)系，則大(da)(da)拇指(zhi)(zhi)(zhi)、食指(zhi)(zhi)(zhi)、與(yu)(yu)中指(zhi)(zhi)(zhi)分(fen)別表(biao)(biao)示(shi)了右(you)手(shou)(shou)(shou)(shou)(shou)坐(zuo)標(biao)系的X軸(zhou)，Y軸(zhou)，與(yu)(yu)Z軸(zhou)，如圖17.3所示(shi)。同(tong)樣，用(yong)左(zuo)手(shou)(shou)(shou)(shou)(shou)也可以(yi)表(biao)(biao)示(shi)出左(zuo)手(shou)(shou)(shou)(shou)(shou)系。