【多选题】
在长沙地铁1号线一期车辆中关于主风缸压力控制功能的说法正确的为___。（摘自维修手册）
A. 空压机主风管压力降到7BAR后将启动两台空压机
B. 空压机主风管压力降到7.5BAR后将启动当日工作为主的空压机
C. 空压机主风管压力降到6BAR后将启动激活单元车组的空压机
D. 空压机主风管压力升到9BAR后将自动停止空压机打风
E. 空压机主风管压力升到10BAR后将自动停止空压机打风
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网络硬线切换定义正确的是：___（摘自维修手册）
A. 硬线：此时EDCU 响应列车硬连线发出的车门开关指令
B. 网络：此时EDCU 响应列车MVB 网络发出的车门开关指开门过程中
C. 硬线：此时EDCU 响应列车MVB 网络发出的车门开关指开门过程中
D. 网络：此时EDCU 响应列车硬连线发出的车门开关指令
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长沙地铁1号线车辆的转向架驱动装置主要功能是：产生（ ）、（）；将驱动力矩、电制动力矩传递到（ ）上。 ___（摘自维修手册）
A. 驱动力矩
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C. 轮对
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车体底架的主要作用是承受 ___。（摘自维修手册）
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长沙地铁1号线车辆轮对主要功能有___。（摘自维修手册）
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长沙地铁1号线车辆的转向架轴箱主要功能是：传递（ ）和（）；将轮对的旋转运动转换为车辆的直线运动；支撑（ ）上载荷。 ___（摘自维修手册）
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A. 所有外部冷却风扇
B. 所有空调单元
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蓄电池充电器(DC/DC)的特点是___。（摘自维修手册）
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