[填空题]
It is not necessary th; gk:6 z+bo4vrow- fxcat +uic z,om /;:om0uxcoa heat engine’s hot environment be hotter than ambient temperature. Liquid nitrogen (77 K) is about as cheap as bottled water. What would be the efficiency of an engine that made use of heat transferred from air atuim u/: mo+c0oox;, zc room temperature (293 K) to the liquid nitrogen “fuel” (Fig. 15–25)? %(Round to the nearest integer)
