凸: Ⅰ动词(高出) bulge; protrude 短语和例子挺胸凸肚 throw out one's chest and bulge one's bellyⅡ形容词(高于周围) protruding; raised 短语和例子凸纹 raised carving or design; 凸花银瓶 [工美] a silver vase with a raised floral de
Specification for procurement of alloy steel protruding head bolts with strength classification 1 250 mpa and mj threads 抗拉强度为1250mpa和具有mj螺纹的合金钢凸头螺栓采办规范