整体产品是指以核心产品、形式产品、期望产品、延伸产品和潜在产品5个层次产品内容为整体的产品。
No more having to buy expensive textbooks which you will only use for a year or two and then sell or _______ away.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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