为了业务需要王某找到李某做保证担保。因李某在合同保证人一栏写上“负责解决”，并签字，所以李某是该合同的保证人。
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A flashing light is a light that（）.
A. flashes at regular intervals at a frequency of 120 flashes or more per minute
B. is yellow in color
C. is visible over an arc of the horizon of not less than 180°nor more than 225°
D. All of the above
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