题目内容
Some casting processes are net shape; others are near net shape.
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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
At the top of down-sprue, a pouring cup is often used to minimize（ ）as the metal flows into down-sprue
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