Physics · Engineering Metrology
0.2 से 0.8 माइक्रोन तक के सतह खुरदरापन (Surface roughness) मानों को इंजीनियरिंग ड्राइंग पर निम्नलिखित में से किस मानक प्रतीक द्वारा दर्शाया जाता है?
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