电子政务安全需求中,_______主要是指信息访问的可控性,即只有被授权的、案例级别与数据机密性要求一致的用户才被允许访问相应的数据。
No more having to buy expensive textbooks which you will only use for a year or two and then sell or _______ away.
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.
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