操作系统为用户提供两种类型的使用接口,它们是______接口和______接口。
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.
操作系统既是硬件与其他软件的接口,又是用户与计算机之间的接口。( )
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