​静止时边长为50cm的立方体，当它沿着与它的一个棱边平行的方向相对于地面以匀速度,运动时，在地面上测得它的体积是（）‌
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单项选择题The following information has been tanken or calculated from Fowler's financial statements for the year ended 30 September 20X5: Cash cycle at 30 September 20X5 70 days Inventory turnover six times Year-end trade payables at 30 September 20X5 2 million Cost of sales for the year ended 30 September 20X5 $1.8 million What is Fowler's trade receivables collection period as at 30 September 20X5?The following information has been tanken or calculated from Fowler's financial statements for the year ended 30 September 20X5:

单项选择题两列正态变量，其中一列是等距或等比数据，另一列被人为地划分为多类，计算他们的相关系数应采用______。A、积差相关B、多列相关C、斯皮尔曼等级相关D、点二列相关