Headset stereos can ______. [br] According the experts, when headset sound reach

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问题 Headset stereos can ______. [br] According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.

选项 A、one hour
B、half an hour
C、two hours
D、three hours

答案 B

解析

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