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In lime concrete, lime is used as
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Normally, when ordinary Portland cement hydrates
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Modulus of rupture of concrete is a measure of
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The valve provided on the suction pipe in a tube well is
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In order to control the flow of water through pipes, a _________________ is provided.
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The pipe joint commonly used in pumping stations is
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The earth’s water circulatory system is known as
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Two primary air pollutants are
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In urban air pollution, the most poisonous gas is supposed to be carbon monoxide. It is hazardous because it
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A river with high BOD value is
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