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समुद्र की गहराई मापने और जल के भीतर पहाड़ियाँ, घाटियाँ, पनडुब्बियाँ, हिमशैलों तथा डूबे जहाजों आदि की निश्चित करने में प्रयुक्त की जा रही तकनीक कौन सी है?

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समुद्र की गहराई मापने और जल के भीतर पहाड़ियाँ, घाटियाँ, पनडुब्बियाँ, हिमशैलों तथा डूबे जहाजों आदि की निश्चित करने में प्रयुक्त की जा रही तकनीक कौन सी है?






 
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