单项选择题
在楼顶安装高度大于4m的产品应()，在搭建加高过程中应做好加固和斜拉等安全措施。
- A.搭人字梯子
B.搭脚手架安装(采用简易门型脚手架)
C.搭拔杆及卷扬机安装
D.工人相互叠加安装
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