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【单选题】
在所平行的投影面上的投影反映线段的实际长度以及其与另外两个投影面的倾角,其它两投影分别平行于相应的投影轴且小于线段的实际长度,原直线在空间中是( )A.
一般位置直线
B.
投影面平行线
C.
投影面垂直线
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【简答题】试求图示所示电路输出电压与输入电压的运算关系式。
【简答题】Please translate THE ARGUMENT in the paper Breslau, D., & Yonay, Y. (1999). Beyond metaphor: Mathematical models in economics as empirical research. Science in Context, 12(2), 317-332. into Chinese. B...
【单选题】UML models include:
A.
state models
B.
state change models
C.
behavior models
D.
all of the above
【单选题】Economics proceeds by making models of ( ), which are simplified representations of reality.
A.
social phenomena
B.
people’s imagination
C.
stories
【单选题】Economics models __________________.
A.
are used as detailed representations that include all aspects of an environmental issue
B.
can be useful for creating solutions to environmental problems if the assumptions are accurate
C.
are likely to produce the same conclusions about environmental issues despite changes in the model's assumptions
D.
can be used to create accurate and concise representations of environmental problems
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