The fluctuation unit of metallic zinc is 5 points, and each point fluctuates once in 5 yuan and 25 yuan (cotton, aluminum and many others).
The fluctuation unit of metallic silver is 1 point, the point is 15 yuan, and the fluctuation is 15 yuan.
The fluctuation unit of iron ore is 0.5, one point 100 yuan, and one fluctuation 50 yuan.
There is also a gold fluctuation unit of 0.05, and the point 1000 yuan fluctuates in 50 yuan.
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