hollow steel短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 空心钢,空心钻 The structures made of square hollow steel sections by using the directly welded joints are fabricated easily and economically, which can be found in many applications all over the world. 由方管直接焊接组成的结构，节点构造简单，加工方便，造价较低，在国内外已被广泛应用到各种工程领域。 fabiao