Hydraulic vacuum servo 液力真空助力器 ; 液力真空助
Vacuum servo brake 真空伺服制动器 ; 真空补充制动器 ; 真空伺服煞
vacuum servo hydraulic brake system 真空伺服液压制动系统
direct vacuum servo 直接真空助力装置
vacuum servo control 负压伺服控制
vacuum guide servo 真空导向器伺服
N a servomechanism that is operated by the lowering of pressure in the intake duct of an internal-combustion engine 真空操动
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