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
参考答案:A
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.
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