The fatigue strength of the metallic material can be increased by which of the following features?
निम्नलिखित में से किस विशेषता द्वारा धातु सामग्री की फटीग सामर्थ्य को बढ़ाया जा सकता है?
Under stressing
Overstressing
Increasing the temperature
Scratching the surfaces
Under stressing
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