【单选题】【消耗次数：1】
复印机在未使用的时候最好能用棉布将其覆盖，防止外来的（ ）。
①
阳光
②
灰尘
③
水汽
④
干燥
参考答案：
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选定复印纸后要抖松消除静电
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Generally saying
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Generally speak
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