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【单选题】
某一套管换热器用饱和蒸汽加热管内空气,设饱和蒸汽温度为100°C,空气进口温度为20°C,出口温度为80°C,问此套管换热器内壁温度
A.
接近空气的平均温度
B.
接近饱和蒸汽与空气的平均温度
C.
接近饱和蒸汽的温度
D.
接近室温
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【判断题】在平面机构中若引入一个高副将引入1个约束,而引入一个低副将引入2个约束。
A.
正确
B.
错误
【单选题】平面机构中若引入一个高副将带入 个约束。
A.
1
B.
2
C.
3
【单选题】在平面机构中若引入一个高副将引入( )个约束,而引入一个低副将引入( )个约束
A.
1,2
B.
1,1
C.
2,2
D.
2,1
【单选题】According to the discussion, what can be concluded about animal language?
A.
Animals do have language.
B.
No conclusion has been made at present.
C.
Animals do not have language.
D.
Some animals have language and others do not.
【简答题】CAN ANIMALS BE MADE TO WORK FOR US? Can animals be made to work for us? Some scientists think that one day animals may be trained to do a number of jobs that are now done by human beings. The...
【单选题】平面机构中若引入一个高副将带入 个约束。
A.
1
B.
2
C.
3
D.
4
【简答题】阅读理解。 Many animals do strange things before an earthquake (地震). This news ma be important. Earthquakes can kill people and knock down houses. The animals may help to save lives. Some animals make a lo...
【单选题】在平面机构中若引入一个高副将引入(     )个约束
A.
1
B.
2
C.
3
D.
4
【简答题】平面机构中若引入一个高副将带入 个约束,而引入一个低副将带入 个约束。
【单选题】平面机构中若引入一个高副将带入   个约束。
A.
0个
B.
1个
C.
2个
D.
3个
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