【单选题】【消耗次数：1】
下列关于物料提升机构造使用做法错误的是
①
A.缆风绳与地面的夹角不应大于60°，应以45°~60°为宜
②
B吊笼（吊篮）的两侧应设置高度不小于 100cm 的安全挡板
③
C缆风绳的一端应连接在架体上，另一端应固定在脚手架上且必须进行设计计算
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