一副扑克牌(去掉两张王牌),每人随意摸两张牌,至少有多少人才能保证他们当中一定有两人所摸两张牌的花色情况是相同的?( )
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