A modern variation on the lunch counter is the fast food operation.
在午餐柜台一个现代的变化就是快餐食品的经营。
The variation of counter-force and bearing force is discussed, the reasons of forward setting are obtained, the calculating formula about forward setting distance is deduced.
从烟囱施爆后做定轴转动的力学分析入手，结合爆破切口的断裂形式，讨论支反力的变化情况，得出了前冲的原因，并推导了前冲距离的计算公式。
The variation of counter-force and bearing force is discussed, the reasons of forward setting are obtained, the calculating formula about forward setting distance is deduced.
从烟囱施爆后做定轴转动的力学分析入手，结合爆破切口的断裂形式，讨论支反力的变化情况，得出了前冲的原因，并推导了前冲距离的计算公式。
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