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Counter-Strike: Source (2004)

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Let \( \eta_{1} \) is the efficiency of an engine at \( T_{1}=447^{\circ} \mathrm{C} \) and \( T_{2}=147^{\circ} \mathrm{C} \) while \( \eta_{2} \) is the efficiency at \( T_{1}=447^{\circ} \mathrm{C} \) and \( T_{2}=47^{\circ} \mathrm{C} \). The ratio \( \frac{\eta_{1}}{\eta_{2}} \) will be:
(a) 0.41
(b) 0.56
(c) 0.73
(d) 0.75
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