可变分区方式是按作业需要的主存空间大小来分割分区的。当要装入一个作业时，根据作业需要的主存量查看是否有足够的空闲空间，若有，则按需要量分割一个分区分配给该作业；若无，则作业不能装入。随着作业的装入、撤离，主存空间被分成许多个分区，有的分区被作业占用，而有的分区是空闲的-Variable district is operating in accordance with the needs of the size of main memory space to split the district.

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