单项选择题装配图中的规定画法,相邻两个零件的剖切线方向必须相反()
单项选择题In “being treated according to Jing” in The Classic of Difficult Issues (Nàn Jīng, 难经), the treatment means ( ). A、Using herbs B、Using 5-element theory to select the mother or son meridian C、Using classical theories D、Using the affected meridian E、Using jing-river points