【单选题】在体积为 V ,绝热良好的刚性密闭容器中发生一化学反应,结果系统的温度升高、压力增大,该过程的 △H ( )(天津大学)
【简答题】春秋战国时代的历史散文大致沿记事与记言两个方向发展。《尚书》中的记言成分,后来发展为以记言为主的《()》;侧重记事的《春秋》则发展成为以记事为主的《左传》;而将记言与记事趋向结合发展成为《()》。
【单选题】Warmblooded animals live an active life even in freezing winter,which helps them to ________ their normal body temperature.
【单选题】In food freezing, there are some factors which damage the food quality, because of .
A.
the growth of ice crystals
B.
the migration of moisture from cells
C.
the increase of solute concentration