Computer · Levelling and Curvature Correction
एक रेखा AB पर बिंदु O पर एक लेवल सेट किया गया है, जो A से 20 मीटर और B से 1200 मीटर की दूरी पर है। 20 मीटर की दूरी के लिए लागू किया जाने वाला वक्रता और अपवर्तन का संयुक्त संशोधन (combined correction) लगभग कितना होगा?
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