這個是戶外的,樓梯之間最多不能相差十八公分,但間隔小一點點更安全,我是這麽理解的。簡單初中幾何也不一定需要啊。
所有跟帖:
• 是啊,你自己算好畫好去交給人家做好了 -mickey222- ♀ (0 bytes) () 09/03/2017 postreply 18:45:28
• 是啊,你自己算好畫好去交給人家做好了 -mickey222- ♀ (0 bytes) () 09/03/2017 postreply 18:45:28
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