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【简答题】
试求反应MgCO3(s) MgO(s)＋CO2(g)的下列物理量： (1)在298 K，100 kPa下的 ； (2)在1123 K，100 kPa下的 和 ； (3)在100 kPa压力下(即PCO2＝100 kPa)进行分解的最低温度。 已知：MgCO3(s)的 ＝－1111．88 kJ．mol－1； ＝65．6 J．mol．K－1。
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A.
was coming
B.
had come
C.
comes
D.
would come
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【单选题】A cosmologist differs from a cosmogonist in that ______.
A.
he sounds a bit old-fashioned
B.
he learns from Edgar Allen Poe
C.
he studies the origin of the whole Universe
D.
he tries to explain how the Solar System formed
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A.
Once
B.
Unless
C.
Whether
D.
While
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A.
瘟疫特别是鼠疫本身具有刺激和推动公共卫生发展的功能。
B.
西方列强势力不断以卫生防疫为理由，侵蚀中国的主权和利益。
C.
中国社会面对民族危机，在追求强国保种的过程中，将卫生视为科学、文明和进步的象征，而颇为自觉加以追求。
D.
中国社会已经普遍意识到公共卫生建设重要性和必要性。
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