单项选择题

使用踪迹表示的“轨迹”按“Esc”键就能清除掉。（） A. 对 B. 错

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单项选择题

In the 2SLS estimation, which one is incorrect?
A、The number of instrumental variables must be larger than or equal to the number of endogenous variables.
B、Every instrumental variable must be correlated with every endogeneous variable.
C、The 2SLS estimator is consistent under regularity conditions in Chapter 7, though its asymptotic variance may be larger than the OLS estimator.
D、 must be finite and of full rank to ensure that the 2SLS estimator is well-defined.

单项选择题

下列关于抗日民族统一战线与革命统一战线的相同点的表述不正确的一项是（）。

A、都在党的倡导和推动下建立
B、以国共两党合作为基础
C、都采取党外合作的方式
D、都具有反帝的性质