铺楼梯板都是先下后上, 先外后内. 先RISE, 后TREAD.
呵, 知道铺楼梯的顺序就不会有这个问题了.
所有跟帖:
• 说得对啊,可不就是不懂么 -sxtra- ♂ (67 bytes) () 03/19/2013 postreply 14:36:48
• 说得对啊,可不就是不懂么 -sxtra- ♂ (67 bytes) () 03/19/2013 postreply 14:36:48
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