举一反三
- When a system moves from A state along path I to B state, it releases heat of 100 J and obtains 50 J work at the same time; when the system does 80J work from A state along path Ⅱ to B state, then Q is（ ） A: 70J B: 30J C: －30J D: －70J
- Which one is not a state function? A: Enthalpy B: Internal energy C: Entropy D: Work/Heat
- Which of the following is not a state function? A: Internal energy B: Free energy C: Work D: Enthalpy
- When<br/>the substance is measured by atomic absorption spectrophotometry, the<br/>state of the substance is ( ) A: Solid<br/>state B: Liquid C: Vapor<br/>state D: Supercritical<br/>state
- The final step in Lewin's three-step description of the change process is ________. A: freezing the new state B: unfreezing the status quo C: changing to a new state D: unfreezing the new state
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6. contact A: the state of talking or speaking B: the state of acting C: the state of communicating or meeting D: the state of laughing
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Why does the existence of intermediate state in the 4-level laser can promote the production of laser beam? A: reach population inversion between ground state and metastable state B: reach population inversion between ground state and intermediate state C: reach population inversion between ground state and pumped state D: reach population inversion between intermediate state and metastable state
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The system is expanded from equilibrium state a to equilibrium state b in the process of I, absorbing 500J of heat, working externally 400J; Then it is compressed to the original state a in the process of II, releasing heat 300J outward. Then, in the process of II, the change of the internal energy is[img=178x135]17e0b762b3b1660.png[/img] A: -100J B: 100J C: 200J D: -200J
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Americans are subject to two governments, that of their state and that of Union, each having its own distinct function.
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Shakespeare was born at a time when the English language was in a state of _______, and when it was _______.