Heat causes the()of gas.
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The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
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Which of the listed effects represents the purpose of heat treating steel?()
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Exhaust temperature increases in all cylinders, the possible cause may be() (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passages
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The normal color of the exhaust gas of the diesel will be ()
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The latent heat of water vapor in air is dependent upon the ()
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The deck water seal of the inert gas system().
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The sensible heat of air is dependent upon the ().
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The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to ()
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The temperature of a refrigerant gas is the highest ().
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Which of the processes listed consumes the greatest amount of power while producing the greatest amount of heat?()
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The fresh air intake of the inert gas system().
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Combustible gas indicators measure the presence of combustible gas as a percentage of the().
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The primary hazard of liquefied petroleum gas and liquefied natural gas is().
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Heat energy is a source of power, but () will cause damage to the engine.
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The component in an inert gas system used for cleaning the gas of solid and sulphur combustion products,while simultaneously cooling the inert gas,is called the().
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After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning?()
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The general purpose of a heat exchanger is to ().
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The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?()
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The movement of heat within a fluid, caused by the application of thermal energy, is called ().
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The spreading of fire as a result of heat being carried through a vessels ventilation system, is an example of heat transfer by ().
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The earth ___the necessary amount of heat and light from the sun()
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Scientists have long believed one way to stop the Earth’s atmosphere from warming is by planting more trees. The idea is that more trees will take in or absorb some of the carbon dioxide in the atmosphere. Carbon dioxide is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s atmosphere, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing carbon dioxide as had been thought.
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城市气体消耗少时,向城市的供气量小于干线的流量(也即末段起点的流量),多余的气体积存在末段管路中,使末段的压力上升。When urban gas consumption is low, the gas supply to the city is less than the flow of the trunk (i.e. the flow at the beginning of the last section), and the excess gas is stored in the last section of the pipeline, causing the pressure at the last section to rise.
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There are many problems in our modern world. One very()serious problem is energy. We get a great () of energy we need from coal, gas, and oil. However, the () of energy which we use is () every year, and we only have enough coal, gas, and oil for the next twenty or thirty years. How will we live () the energy which these things give us? Scientists are looking for () to this problem. They are looking for new () to produce energy. For example, they are working with new ways to () energy from the light and heat of the sun. They are also working with plans which produce energy from () of the oceans. All of the new methods () scientists are finding are still very expensive, but perhaps they will help solve our energy problems () the future.
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