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【简答题】
Exercises for Nomenclature of Inorganic Compounds (I) CaBr2 CuCl Fe2O3 HF KCN N2O3
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参考答案:
举一反三
【判断题】Unlike the General Agreement on Tariffs and Trade (GATT 1994), the General Agreement on Trade in Services (GATS) establishes only a single set of obligations that apply to all measures affecting trade...
A.
正确
B.
错误
【简答题】The World Trade Organization was founded in 1995. It absorbed the General Agreement on Tariffs and Trade (GATF), which covers trade in manufactured and agricultural goods. The WTO also regulates trade...
【判断题】Unlike the General Agreement on Trade in Services (GATS), the North American Free Trade Agreement (NAFTA) requires member states to list the service sectors to which the NAFTA rules do not apply. r si...
A.
正确
B.
错误
【单选题】已知某单位负反馈系统的开环传递函数为,则对该系统的根轨迹的描述正确的是:【图片】
A.
起点为 0 , -1 , -0.5
B.
三条渐近线角度分别为 60 度、 -60 度、 90 度
C.
实轴上( -1 , 0 )和( -1 , -2 )为根轨迹
D.
根轨迹会随着 K 增加穿过虚轴到右半面
【判断题】Unlike the General Agreement on Tariffs and Trade (GATT 1994), the General Agreement on Trade in Services (GATS) does not provide for any general exceptions or security exceptions to its rules.
A.
正确
B.
错误
【简答题】It is so important that it is the first article of the General Agreement on Tariffs and Trade (GATT), which governs trade in goods. MFN is also a priority in the General Agreement on Trade in Services...
【单选题】对某一单位负反馈系统,其开环传递函数为【图片】 ,则实轴上的根轨迹为( )
A.
(-4,∞)
B.
(-4,0)
C.
(-∞,-4)
D.
(0,∞)
【单选题】某单位负反馈系统的开环传递函数为【图片】,若s平面实轴上的-2.5点为其根轨迹的分离点,则此时第三闭环极点的实部为
A.
0
B.
-1
C.
-2
D.
-2.9
【多选题】某单位反馈系统开环传递函数如下: 则对应的实轴根轨迹为( )。
A.
(负无穷,-20]
B.
[-20,-6]
C.
[-6,-3]
D.
[-3,0]
【单选题】对某一单位负反馈系统,系统的开环传递函数为 【图片】,则实轴上的根轨迹为( )
A.
(-2,-1)和(0,∞)
B.
(-∞,-2)和(-1,0)
C.
(0,1)和(2,∞)
D.
(-∞,0)和(1,2)
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