计算机病毒具有_______、 传染性、 隐藏性|、潜伏性、不可预见性和针对性等特征。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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