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以下哪几条正确描述了手制动机的用途( )A.
把作用在制动缸活塞上的压缩空气推力增大适当倍数以后，平均地传递给各块闸瓦，阻止车轮转动而产生制动作用。
B.
当列车或车辆停放在有坡度的线路上时，用手制动机制动，防止列车或车辆溜走。
C.
在车站和专用线上施行手制动作用可防止车辆意外移动。
D.
在调车作业时使用手制动机调整车速或停车，保证作业安全。
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