International standards of weights are made of (gold-silver / platinum-iridium) alloy.

Materials: Metals and Non-Metals

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14/04/2021 11:13 am

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Rohit1998

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International standards of weights are made of (gold-silver / platinum-iridium) alloy.

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14/04/2021 11:14 am

Nupoor1234

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Platinum-iridium.

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