A．speedB．rhythmC．ratesD．ratio

Energy losses due to _____ occur in every machine.A.speedB.frictionC.impactD.atmosphere

The injection decides the output and therefore, the （) of the engine.A.speedB.sizeC.power

【C5】A．speedB．frequenciesC．ratesD．proportion

【C17】A．proportionsB．percentagesC．ratesD．ratios

【C18】A．creditsB．ranksC．ratingsD．ratios

【C9】A．proportionB．percentageC．rateD．ratio