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Two metals of different coefficients of expansion welded together so that the piece will bend in one direction when heated, and in the other when cooled, and can be used to open or close electrical circuits, as in thermostats.

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行业/领域：能源
类别能源效率
Company: U.S. DOE
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sladjana milinkovic

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изоловани језик

Isolating languages tend to form their words of single morphemes (that is, of roots without affixes). They often use several short words where another ...