短语词组短語hollow electron beam [電子]空心電子束;中空電子束Hollow Flange Beam 空翼緣梁hollow no beam roof 空心無梁樓蓋hollow girder beam 空心板梁hollow w beam 空心梁prestressed hollow plate beam 先張空心板梁hollow arbor beam 琯梁hollow board beam 空心板梁 返回 hollow beam