题目内容
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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Gating System in sand casting consists of a down-sprue, through which metal enters a（ ） leading to the main cavity
In sand casting, the use of a Core in the Mold Cavity provides（ ）
For sand casting when the（ ）is removed, the remaining cavity of the packed sand has desired shape of cast part
Sand Casting Mold consists of two halves, the Cope is the upper half of mold and the bottom half called the（ ）
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