A.Personal information. B.Political scandals. C.Business affairs,
A. Personal information.
B. Political scandals.
C. Business affairs,
D. Religious events.
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A.Major European airlines will go bankrupt,B.Europeans will pay much less for tra
A. Major European airlines will go bankrupt,
B. Europeans will pay much less for traveling.
C. Traveling time by train between major European cities will be cut by half.
D. Trains will become the safest and most efficient means of travel in Europe.
压气机所需要的功可从第一定律能量方程式导出，试导出定温、多变、绝热压缩压气机所需要的功并用T-s图上面积表
回热系统中回热器一种是混合式回热器，靠蒸汽与水的混合达到换热的目的。另有一种表面式回热器，如图所示，蒸汽在管外冷凝，将凝结热量传给管内的水，这种布置可减少系统中高压水泵的数量。试分析这种系统在热力学分析上与混合式系统是否有不同？
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