皮皮学，免费搜题
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【单选题】
把闹钟放在玻璃罩内，抽出罩内的空气，在抽气过程中，（ ）A.
听到闹钟走动声不变
B.
听到闹钟走动声越来越来大
C.
听到闹钟走动声越来越来小
D.
可能
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皮皮学刷刷变学霸
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