点浇口热嘴,适用于各种塑料,进浇点呈点状,产品表面有一个圆,换色性能佳。
DPSZ type hot nozzle, suitable for all kinds of product, it shows point shape when entering the gate, there is a circle on the surface of the product, easy to change the color.
圆色数和分式色数是图的点色数的两个推广。
The circular chromatic number and the fractional chromatic number are two generalizations of the ordinary chromatic number of a graph.
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