基本解釋銲縫裂紋詞組短語(yǔ)短語(yǔ)bead weld cracking test 銲縫開(kāi)裂試騐bead catalytic cracking catalyst 小球催化裂化催化劑bead crack更多詞組專(zhuān)業(yè)釋義交通運(yùn)輸工程銲道裂紋