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Q. |
Why is invar used in bimetallic strips? |
A. | low density |
B. | low coefficient of expansion |
C. | high-temperature resistance |
D. | high abrasion resistance |
Answer» B. low coefficient of expansion | |
Explanation: most bimetallic strips are composed of invar and yellow brass as metal. invar has the advantage of low coefficient of expansion, whereas yellow brass has the ability to be used at low temperatures. |
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