题目内容
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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Workers who perform casting are called（ ）
Casting can create complex part geometries with （ ）
Steps in casting are correspondently simple, first melt the metal, second pour it into a mold and thirdly（ ）
Casting is the process in which （ ）-metal flows by gravity or other force into a mold where it solidifies in the shape of the mold cavity
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