举一反三
内容
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Sofar,scientistshaven’tfoundanyevidenceofwaterthat______lifeonMars.
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—Sofar,how long _________ you _________China?
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Sofar,themoon________bymanalready. A: isvisited B: willbevisited C: hasbeenvisited D: wasvisited
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Sofar,I_____TheForbiddenCityinBeijing. A: hasvisit B: havevisited C: hasstayed D: visited
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Sofar,wehaveconsideredvariousformsofenergysuchasheatQ,workWandtotalenergyEindividually,andnoattempthasbeenmadetorelatethemtoeachotherduringaprocess.Thefirstlawofthermodynamics,alsoknownastheconservationofenergyprinciple,providesasoundbasisforstudyingtherelationshipsamongthevariousformsofenergyandenergyinteractions.Basedonexperimentalobservations,thefirstlawofthermodynamicsstatesthatenergycanbeneithercreatednordestroyed;itcanonlychangeforms.Therefore,everybitofenergyshouldbeaccountedforduringaprocess.