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赫斯定律
chem. Hess law; law of constant heat summation
met. Hess's law (【技】化学反应的反应热总和只由反应起始和终了状态所决定。因此，当对化学反应热计算有困难时，可直接用此定律计算。)
oil Hess'law
tech. the law of constant heat summation

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