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热力学第一定律 rèlìxué dìyī dìnglǜ
railw. the first law of thermodynamics
refrig. equivalence principle; first principle of thermodynamics
wind. first law of thermodynamics
【物】热力学第一定律 rèlìxué dìyī dìnglǜ
avia. first law of thermodynamics