题目内容
Steps in casting are correspondently simple, first melt the metal, second pour it into a mold and thirdly（ ）
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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
Most Brittle materials are（ ）
Most ductile materials are（ ）
Brittle materials have（ ）plastic deformation and low energy absorption before fracture
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