题目内容
Casting can produce very large parts with weight more than 110 tons.
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Some casting processes are net shape; others are near net shape.
The term casting also applies to the part made in the process.
Pure metal solidifies at a （ ）temperature equal to its freezing point (same as melting point).
Riser is a reservoir in the mold which is a source of liquid metal to compensate for（ ） of the part during solidification
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