题目内容
55.With RFID technologies, each individual piece of merchandise will have a unique ____.
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49.Which of the following can be placed in the human body to store important information about a person, such as medical history, and can be GPS-enabled to offer a method of tracking?
50.Which of the following is a standard for transmitting information in the form of short-range radio waves over distances of up to 30 feet?
53.Which of the following refers to a wireless transmission technology developed primarily for mobile phones to support mobile commerce and other phone activities?
数据模型是数据库中数据的存储方式，是数据库系统的基础。在几十年的数据库发展史中，出现了许多重要的数据库模型。目前，应用最广泛的是（）模型
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