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单选题
继电器是高级电源中的标准部件。当继电器吸合时会发出咔哒声。
A
Relays are standard components for advanced power supplies. When the relay is closed, it makes a click.
B
Relays are standard components for advanced power supplies. When the relay is closed, it makes a chime.
C
Relays are standard components for advanced power supplies. When the relay is connected, it makes a chime.
答案解析
正确答案：C
