（）sometimes called filter, is a device designed to prevent the passage of unwanted solids into the system.

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• 在一个Filter中，处理filter业务的是（）方法。

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• The main distribution duct in an air conditioning system which contains the cooling coils and filters is called the（）

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• A （）, sometimes called filters, is a device designed to prevent the passage of unwanted solids into the system.

  A . steam trap B . check valve C . separator D . strainer

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• Strainers, sometimes called （）, are devices designed to prevent the passage of unwanted solids into or further along a system.

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• AS-PATH列表{as-path-filter}配置命令ipas-path-filter as-path-filter-number{denypermit}regular-expression，可以为同一个as-path-filter-number配置多个子句，请问这多个子句间的匹配原则是（）

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• 有如下两个community-filter Ip community-filter 1 permit100：1200：1 Ip community-filter 2 permit100：1 Ip community-filter 2 permit200：1 下面哪些描述是错误的？（）

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• A _____________________ is sometimes called a Form A.

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