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【单选题】
For the circuit, using ideal diode model, what is the voltage u when t=1.5π?
A.
0
B.
5
C.
10
D.
15
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【单选题】互感器的二次绕组必须一端接地,其目的是()
A.
提高测量精度
B.
确定测量范围
C.
保证人身安全
【单选题】Which of the following could be the best title for this article?
A.
Study Habits and Time Management
B.
Business Management and Leadership
C.
University Education and Campus Life
D.
Life Goals and Academic Development
【简答题】已知下列反应在298.15K时的热效应。 (1) , (2) , (3) , (4) , 求反应
【单选题】已知298.15K时,下列反应的热效应:(1) ;(2) ;(3) ;(4) 的 (单位:kJ)等于()
A.
515
B.
339.2
C.
-339.2
D.
-515
【单选题】Which of the following is not the factor of increasing the risk of hypertension?
A.
obesity
B.
a tendency in the family to suffer hypertension
C.
excessive salt intake
D.
loss of weight
【简答题】已知下列反应在298K的时热效应。 (1)Na(s)+ Cl2(g)==NaCl(s) △rHm=一411kJ (2)H2(g)+S(s)+2O2(g)==H2SO4(l) △rHm=一811.3kJ (3)2Na(s)+S(s)+2O2(g)==Na2SO4(s) △rHm=一1383kJ (4) ==HCl(g) △rHm=92.3kJ 求反应2NaCl(s)+H2SO4(1)==Na2SO4...
【简答题】已知下列反应在298K的时热效应。 (1) Δ r H m =-411kJ (2)H 2 (g)+S(s)+2O 2 (g)====H 2 SO 4 (l)  △ r H m =-811.3kJ (3)2Na(s)+S(s)+2O 2 (g)====Na 2 SO 4 (s)  △ r H m =-1383kJ (4) △ r H m =-92.3kJ 求反应2NaCl(s)+H 2 SO 4 (...
【判断题】缩放对象能改变对象的实际大小。
A.
正确
B.
错误
【简答题】已知下列反应298K时的热效应: (1)C(金刚石)+O2(g)==CO2(g) △rHmΘ=一395.410 (2)C(石墨)+O2(g)==CO2(g) △rHmΘ=一393.510 求C(石墨)==C(金刚石)在298K时的△rHmΘ。
【单选题】Which of the following is the most appropriate title of the passage?
A.
Landing on the Moon
B.
Astronauts and Spacecraft
C.
A Space Right
D.
The Space Exploration
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