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问题 单项选择题

现代航空气象要求航空气象产品逐步实现全球化、（）、定量化、自动化和精细化，为用户提供便捷、高效、智能化的数据服务。

A.客观化

B.主观化

C.定时化

D.定点化

答案

参考答案：A

单项选择题

The DJIA is a biased measure and has been criticized. Which of the statements below regarding the bias and criticisms of a price-weighted series is false()

A. Because it is price weighted, when companies have a stock split, their prices decline, and therefore their weight in the DJIA is reduced.

B. The weighting scheme causes a downward bias in the DJIA, because the stocks that have higher growth rates will have higher prices.

C. Because the series is price weighted, a high-priced stock carries more weight than a low priced stock.
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多选题

如图，图中实线是一簇未标明方向的由点电荷产生的电场线，虚线是某带电粒子通过该电场区域时的运动轨迹，a、b是轨迹上的两点，若带电粒子在运动过程中只受到电场力作用，根据此图可以作出正确判断的是（　　）

A．带电粒子所带电荷的正、负

B．带电粒子在a、b两点的受力方向

C．产生该电场的点电荷的电性

D．带电粒子在a、b两点的加速度何处较大
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