问题
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What is the purpose of a relief valve?A.to fill 2 tanks at the same timeB.to use pump at a
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Which of the turbo-charging systems listed operates with the least average back pressure i
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Many electric car owners consider the debate over charging points all a bit of a fuss.
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Charging-air pressure increases if there is incorrect combustion and drop in the _____ of
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In the _____ pressure charging system the pulse of energy that occur as the exhaust is rel
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The efficiency of coal-charging machine is very high, ______, 1 500 tons of coal per hour.