盾构的基本构造有盾构钢壳体,( ),推进机构系统,衬砌拼装系统
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
某城市地铁工程采用盾构法施工,采用密闭式盾构掘进,进出洞位置处外侧土体采取了合理的改良措施,在盾构过程中对壁后进行注浆
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