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प्रश्न
How do submarines sink and float in water?
एका वाक्यात उत्तर
उत्तर
Submarines change the level of floating by pumping in and pumping out water into their compartments.
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Principle of Floatation (Laws of Flotation)
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
