Because so it can satisfied with the rigid request thin design, can maintain the highlights and appearance.
因为这么既能够满意薄型设计的刚性请求，又能够维持高光外表。
The first method is USES traditional the security method - rigid body limit zero-method, obtains the safety coefficient can satisfy the standard request.
第一种方法是采用传统的安全系数法-刚体极限平衡法，求得的安全系数能满足规范要求。
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