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In SAE designation of steel, last two digits indicate the ______.

Q.  
In SAE designation of steel, last two digits indicate the ______.


Answer & Explanation

In the SAE (Society of Automotive Engineers) designation system for steel, the last two digits represent the average percentage of carbon in the steel. For example, a steel labeled "1045" indicates that it contains 0.45% carbon.

Thus correct option is: A.

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