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单选题
Hydraulic systems include the units and components which furnish hydraulic fluid under pressure (includes pumps, regulators, lines, valves, etc.) to a common point (manifold) for redistribution to other defined systems.
A
A.液压系统包括将一定压力（包括泵、压力调节器、管路、阀门）的液压油输送到一个汇聚点（总管），再分配到用户系统的部件和组件。
B
B.这些单位和组件在压力作用下将液压油输入到包括油泵、压力调节器，管路，活门等部位，最后到达一个公共地点，即分配阀，是为了再次分配到其他设定好的系统中。
C
C.这些单位和组件将液压油输入到各个压力组件中，包括油泵、压力调节器，管路，活门等。后来液压油汇聚到一个通用点（分配阀），为了再分配到其他定义好的系统中。
答案解析
正确答案：A
相关知识点：
液压系统输油到总管，再分配到其他系统
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