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第1题

Although cast irois a fairly cheap material, each casting requires a .
· pattern
· model
· mold
· pate
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第2题

Rotating shafts particularly those that ruat high speeds, must be designed to avoid operatioat speeds.
· low<
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第3题

Most frames _______ cast iron, weld steel, composition, or concrete.
· are made from
· are made up of
· was pro
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第4题

The word______ itself usually refers to the deterioratioof metals and ceramics, while similar phenomena iplastics genera
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