在可供选择的方案中,存在两种或两种以上的自然状态,哪种状态最终会发生时不确定的,但是每种自然状态发生的可能性即概率大小事可以估计的,这类决策是( )
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.
免费的网站请分享给朋友吧