Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot_____________________?

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Large diameter reinforced cement concrete (RCC) pipes are generally joined by ____________________ joint ?

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The noble metals________________?

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Ferromagnetic materials owe their properties to __________________ inner sub-shells ?

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The starting of a car takes time in winter, because the__________________?

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A solar cell converts the sunlight directly into ______________ energy?

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