Chemistry
PVC stands for:
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Places where the temperature of air is above freezing point of the water, the precipitation will be in the form of ________ ?
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Bronze medal is made up of metals ?
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Pitch is produced by
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About 50% of the Earth’s crust, including the waters on the Earth and atmosphere, is?
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An element that does not occur in nature but can be produced artificially is__________?
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Medium sized kidney stones are removed by__________?
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Main stimulant in tea:
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Exothermic reaction________________?
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