单选题Energy loses （）friction occurs in every engine.AbecauseBthanks toCdues toDowing to
单选题
Energy loses （）friction occurs in every engine.
A
because
B
thanks to
C
dues to
D
owing to
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Although an Olympic medal loses its luster after years of storage, a hero never loses his credibility if he stops looking to the needs of others.()
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Which of the following statements in supported by the passage?A．The sun shines constantly and gives out the same amount of energy every year．B．The cause of the sun’S fluctuations is its loss of energy with each passing yearC．It is sure that the energy sent out by the sun will drop when more sun spots appear．D．Fluctuations in weather pattems are the results of the pull of gravity．
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单选题A centrifugal pump produces flow with a resulting discharge head by energy conversionIt is typical for the energy conversion to follow the order of （）.Amechanical energy to kinetic energy to potential energyBmechanical energy to potential energy to kinetic energyCpotential energy to mechanical energy to kinetic energyDkinetic energy to mechanical energy to potential energy
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单选题The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.Aspecific gravityBviscosityCS E numberDhydrolytic stability
单选题Energy losses due to （） occur in every machine.AspeedBfrictionCimpactDatmosphere