This means that an alternate source used by the facade must return either valid IDs or no IDs.
这意味着，facade所使用的备用源必须返回有效的ID或者不返回ID。
An alternate embodiment includes a support frame for positioning the filtration system in ductwork or the like other than a return air inlet.
一个替代实施例包括用于将过滤系统定位在除回风管之外的管路等等中的支承框架。
An alternate embodiment includes a support frame for positioning the filtration system in ductwork or the like other than a return air inlet.
一个替代实施例包括用于将过滤系统定位在除回风管之外的管路等等中的支承框架。
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