●An operating system is (74) .
(74) A. the highest layer of software
B. the lowest layer of software
C. the highest layer of hardware
D. the lowest layer of hardware
●An operating system is (74) .
(74) A. the highest layer of software
B. the lowest layer of software
C. the highest layer of hardware
D. the lowest layer of hardware
B【解析】操作系统是最底层的软件。
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