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【单选题】
用流速仪施测某点的流速,实际上时测出流速仪在该点的( )A.
转速
B.
水力螺距
C.
摩阻常数
D.
测速历时
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【简答题】3–15 A piston–cylinder device initially contains 50 L of liquid water at 40°C and 200 kPa. Heat is transferred to the water at constant pressure until the entire liquid is vaporized. (a) What is the m...
【简答题】Find the entropy change of the system and of the surroundings if 3.000 mol of water freezes reversibly at 1.000 bar. The freezing temperature is 0.00°C at this pressure, and the specific enthalpy chan...
【单选题】A student performed an experiment to measure the enthalpy change of combustion of ethane. He used the following values for the standard enthalpy changes of combustion of carbon and hydrogen.
A.
‘’
B.
；
C.
】
D.
、
【单选题】For which reactions does the value of ∆H represent both a standard enthalpy change of combustion and a standard enthalpy change of formation?
A.
123
B.
12
C.
23
D.
1
【单选题】Under the conditions existing in biological systems (including constant temperature and pressure), changes in free energy, enthalpy, and entropy are related to each other quantitatively by the equatio...
A.
△ H – T ÷ △ S
B.
△ H – T △ S
C.
△ S – T ÷ △H
D.
△ S – T △ H
【单选题】The table shows the enthalpy change of neutralisation per mole of water formed, ∆H, for various acids and bases.
A.
】
B.
；
C.
‘’
D.
【】
【单选题】Hydrogen peroxide slowly decomposes into water and oxygen. The enthalpy change of reaction can be calculated using standard enthalpies of formation.
A.
；
B.
‘’
C.
、
D.
。
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