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In injection moulding, molten plastic, for example, is injected into a water-cooled mould and takes the shape of the mould when it solidifies. In blow moulding, air is blown into a blob of molten plastic inside a hollow mould. In compression moulding, synthetic resin powder is simultaneously heated and pressed into a mould.
The five points of the star represent the unity of farmers, workers, intellectuals, soldiers, and youth in establishing socialism. Red stands for revolution and bloodshed. Effective date: 2 July 1976.
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