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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The transition of the Earth’s magnetic field is possibly caused by _____.A
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the mechanical energy of the solar systemD
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