题目内容：
______是配置在计算机硬件上的第一层软件，是对硬件系统的第一次扩充。
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选择题：______是配置在计算机硬件上的第一层软件,是对硬件系统的第一次扩充。
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请在(44)处填上最佳答案。
请在（44）处填上最佳答案。
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