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Rupesh Rao

बॉल पेन किस सिद्धांत पर काम करता है।

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Rupesh Rao, 9 months ago ago

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Science

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2 Answers

Nandana Ghosh

Friction

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Nandana Ghosh, 8 months ago

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ANIL KUMAR GOUDA

Less Surface tension

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ANIL KUMAR GOUDA, 8 months ago

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