投资风险程度通常以能反映概率分布离散程度的________来确定。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
反映离散趋势的统计量通常有________。
免费的网站请分享给朋友吧