抽象数据类型可用(D,S,P)三元组表示,其中,D是__对象,S是D上的__集,P是对D的基本操作集合
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.
一项病例对照研究数据如下,其OR值为()
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