Use the vector dot product to find the obtuse angle between two diagonals of a cube . 用矢量點(diǎn)積求立方體的兩條對(duì)角線所夾的鈍角。
two opposite corners of this rhomb contain three obtuse angles of 101°55'. 菱面體的兩個(gè)對(duì)頂包含著三個(gè)10155'的鈍角。
Above the skin surface , obtuse angle 表皮上方鈍角
The nano - sized caco3 particles were well dispersed in the pvc matrix , the sharp angles that formed when the pvc molecular chains stressed have an tendency to be changed to the obtuse angles . therefore , the stress concentration could be $ 納米caco _ 3粒子在pvc基體中的良好分散,可以使pvc分子鏈在受力過程中形成的銳角鈍化,從而避免應(yīng)力集中、彌補(bǔ)缺陷,起到增韌增強(qiáng)pvc的作用。