Which of the following is NOT one of the advantages of mini-computers? Sometimes cooling systems have to be installed ______.

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问题 Which of the following is NOT one of the advantages of mini-computers?
Sometimes cooling systems have to be installed ______.

选项 A、to keep the computer from becoming too hot
B、in order to save power
C、because they are necessary for a modern computer to work efficiently
D、to ensure the normal working of a mini-computer