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单选题
给插座安装盖子，确保外来物不会进入插座。
A
Install caps on the receptacles to make sure that unwanted material does not go into the receptacles.
B
To ensure foreign objects do not get into the connectors, you should install caps.
C
To keep the unwanted material away from the receptacles, install plugs on them.
答案解析
正确答案：A
相关知识点：
插座装盖子，防异物进入
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