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谜面:薄薄一张口,能啃硬骨头。吃肉不喝汤,吃瓜不嚼豆。(打一常用物)
谜底:菜刀
解谜:如何选一把好刀,有学问:选刀时,应看刀的刃口是否平直,刃口平直的,磨、切用都方便。未开刃的菜刀可用锉刃口,如感觉发滑,证明菜刀有钢,也有硬度。也可用刃口削铁试硬度,如把铁削出硬伤,说明有钢有硬度。