在观测直立式水尺读数时，观测员身体应蹲下，使视线（）与水面平行，以减少折光产生的误差。
A、必须
B、要求
C、尽量
D、完全
参考答案：C
An analyst does research about common probability distribution and estimates an asset turnover ratio will range from 1.7 to 2.4. If the ratio follows continuous uniform distribution, the probability the company's asset turnover ratio will be less than 2.1 is closest to:
A. 43.9%B. 57.1%C. 70.0%
试述实现传媒受众消费的主要渠道有哪些？
