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多项选择题

解释变量内生性产生的原因包括（）

A．测量误差
B．联立方程
C．解释变量之间相关
D．遗漏变量
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相关考题

单项选择题
3) Four trials of Young’s double-slit experiment are conducted. (a) In the first trial, blue light passes through two fine slits 400 mm apart and forms an interference pattern on a screen 4 m away. (b) In a second trial, red light passes through the same slits and falls on the same screen. (c) A third trial is performed with red light and the same screen, but with slits 800 mm apart. (d) A final trial is performed with red light, slits 800 mm apart, and a screen 8 m away. Rank the trials (a) through (d) from the largest to the smallest value of the angle between the central maximum and the first-order side maximum. In your ranking, note any cases of equality.
A．b = d > a > c
B．b > a > c = d
C．a > c = d > b
D．d > b > c > a
未知题型
根据药品标准或制剂规范等规定的处方，将原料药物加工制成具有一定规格，可直接用于临床的药物制品的是（）
单项选择题
平阀式放气系统由（）等部件共同组成。
A.放气阀、转数计、C.I.T.传感器、连杆、控制钢绳
B.放气阀、转数计、
C.I.T.传感器、活塞、控制钢绳C.放气阀、液压调速器、C.I.T.传感器、连杆、控制钢绳
D.放气阀、液压调速器、C.I.T.传感器、活塞、控制钢绳
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