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单选题
Vacuum subsystems are those units and components used to generate, deliver and regulate below atmospheric pressure air, including pumps, regulators, lines, etc., through and including the manifold.
A
真空子系统是指用于产生、输送和调节高于大气压的空气的装置和部件，包括泵、调节器、管线等，该子系统还包括歧管。
B
真空子系统是指用于产生、输送和调节低于大气压的空气的装置和部件，包括泵、调节器、管线等，但该子系统并不通过和包括歧管。
C
真空子系统是指用于产生、输送和调节低于大气压的空气的组件和部件，包括泵、调节器、管线等以及总管和流经总管的部件。
答案解析
正确答案：C
相关知识点：
真空子系统部件及作用牢记
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