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单选题
Mechanical energy in transition is referred to as （）.
A
horsepower
B
work
C
heat
D
velocity
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过渡高度与过渡高度层之间的空间。（）A、The airspace between the transition altitude and the transition level.B、The airspace between the transition height and the transition level.C、The airspace between the transition height or the transition level.D、The airspace between the transition altitude or the transition level.
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单选题In a diesel engine, offers the heat energy directly（）； works as working medium and changes the heat energy to mechanical energy（）A
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单选题Since heat will not flow freely from a body at a （） temperature to another at a （） temperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.A
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单选题The energy consumed by an AC motor, as strictly reactive power, is （）A
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单选题Some of the energy fed into the pump will be dissipated as （） due to mechanical inefficiencies, the remainder will be converted into pressure rise and fluid velocity.A
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单选题A transformer in an electric circuit serves to （）A
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单选题The transition of the Earth’s magnetic field is possibly caused by _____.A
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the periodical movement of the EarthC
the mechanical energy of the solar systemD
the force coming from outer space
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