与凹槽相对的通风孔内端与凹槽连通。
The inner ends of the vent holes corresponding to the grooves are communicated with the grooves.
后桥与车轮相连，内端装有一个半轴齿轮。
The rear axles are attached to the wheels and have bevel side gears on their inner ends.
介绍了电动内端门的构成、控制系统及工作流程。
Described are the composition, control system and working process of the electrical inner end door.
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