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（四）塔式起重机在工业与民用建筑施工中，是完成建筑构件及各种建筑材料与机具 等吊装工作的重要设备。了解塔机的分类、主要技术性能与使用特点，对塔机的合理选择 与使用有着十分重要的作用。试问： 起重量为30～150kN的塔式起重机适用于( )。（单选题）A.六层以下民用建筑施工 B.一般工业建筑与高层民用建筑施工 C.重工业厂房的施工和高炉等设备的吊装 D.各种高度和跨度的工业建筑和民用建筑 塔式起重机按其变幅方式可分为( )等多种形式。（多选题）A.上回转 B.水平臂架小车变幅 C.下回转 D.动臂变幅 E.轨道式 上回转自升塔式起重机都可改成附着式塔式起重机。( )（判断题） 塔式起重机按装置特性分( )。（多选题）A.附墙式 B.内爬式 C.外爬式 D.履带式 E.轨道式
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