标准 P11 执手以及其他窗执手，最大方刚规格是 L=45mm，标准长度范围内的执手使用
强度通过检验验证。执手方刚长度＞50mm 时，由于方刚外露过长，力矩过大，对执手的使用
性能存在一定风险，需附带客户风险承担书。
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