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第1题

One no-bake approach, called the shell core process, is similar in principle to the shell molding process. Like shell mo
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第2题

But in factories and all other places where radioactive materials are used, great care must be taken to prevent anyone f
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第3题

A broaching line which produces a completely broached (linking) rod and cap every 12 seconds comprises two linked standa
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第4题

The process of the clutch(离合器)engagement(接合,啮合) when starting the automobile is introduced. The influencing factors of c
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