常見例句雙語例句The long span dome structure are mostly steel truss structure. The member of steel truss are almost round steel tube, and curve chord.大跨度穹頂建筑物多采用鋼桁架體系，鋼桁架的桿件一般采用圓鋼管，弦桿為曲線。 返回 round steel tube member