571.用于产生,通过总管输送和调节低于大气压的空气组件和部件,包括泵,调节器,管路等。( )

　Air assemblies and parts, including pumps, regulators, piping, etc., used to produce, transport and regulate low pressure external air through the main manifold.

　Those units and components used to generate , deliver and regulate below atmospheric pressure air, including pumps, regulators, lines, etc., through and including the manifold.

　Parts of a system used to produce, transport and regulate air below atmospheric pressure, including pumps, regulators, ducts, etc.

答案解析

正确答案：B

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