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• To obtain good heating efficiency, this ratio is usually 3:1 when the work is to be heated all the way through and 10:1 when it is to be surface hardened.
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Русско-английский научно-технический словарь
на Gufo.me
• To obtain good heating efficiency, this ratio is usually 3:1 when the work is to be heated all the way through and 10:1 when it is to be surface hardened.