The principal advantages of precast segmental construction may be summarized as follows : 1 . as the girders are fabricated segmentally, there are reliable qualities and small ventures during superstructure construction 预制节段拼装技术的主要优点有:(1)梁体分段预制,施工质量好,风险小;上部结构几何线形容易控制。
Though multiple submucosal lipomas or lipomatous polyposis involving the small and large intestine segmentally or diffusely have been described [ 1, 2 ], diffuse lipomatous polyposis of colon is still very rare and is infrequently encountered in clinical practice 虽然局部或广泛发生在小肠或大肠的脂肪瘤或脂肪息肉病已被提及过,然而大肠广泛脂肪息肉病仍然少见且甚少在临床上被提出。