选择题:The real costs of NAFTA and the WTO for workers, c

题目内容:
The real costs of NAFTA and the WTO for workers, communities, and businesses were greatly underestimated in the debates over theses agreements, and the promised benefits have failed to materialize. But the conclusion to be drawn is not that further trade liberalization should be stopped.
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对称的形体需画剖面图或断面图时,可以_________为界,一半画视图(外形图),一半画剖面图或断面

对称的形体需画剖面图或断面图时,可以_________为界,一半画视图(外形图),一半画剖面图或断面图。

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设函数f(x)再点X0处可导,则limh-0f(x0=3h)-f(x0)/h等于()

设函数f(x)再点X0处可导,则limh-0f(x0=3h)-f(x0)/h等于() A. -3f′(x0) B. 3f(x0) C. -2f′(x0) D.

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对于偏心拉压构件,其截面的中性轴与外力F无关,仅取决于力的偏心距和横截面形状和尺寸。( )×√

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14.设A的三阶方阵,其特征值分别为1,2,3,则|A^-1-E|=

14.设A的三阶方阵,其特征值分别为1,2,3,则|A^-1-E|=

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5.求向量组α1=(1 1 1 3),α2=(-1 -3 5 1)α3=(3 2 -1 4)α4=(

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