Q4: How to clean filters?
A、Theycanbevacuumcleaned.
B、Theycanbecompressedaircleaned.
C、Theycanbevacuumcleanedorcompressedaircleaned.
D、Theycanbevacuumcleanedandcompressedaircleaned.
发布时间：2025-09-06 05:35:44
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答案：C
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