【单选题】【消耗次数：1】
悬臂安装时按照（）的原则进行。
①
从下至上，先下平面，后立面，尽快形成三角形稳定结构，最后安装上平面
②
从下至上，先立面，后上平面，尽快形成三角形稳定结构，最后安装上平面
③
从下至上，先上平面，后立面，尽快形成三角形稳定结构，最后安装上平面
④
从上至下，先下平面，后立面，尽快形成三角形稳定结构，最后安装上平面
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