Which of the following components works with the brake disc？
A. Brake-shoes
Brake clamp
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Translate：Wheel Flange Lubrication Device.
A. 轮辋润滑装置
B. 踏面润滑装置
C. 轮缘润滑装置
Which of the following is not the states of coupler operation ？
A. Locked position
B. Open position
C. Lockset position
D. Full open position
翻译下列词汇2. Collector head3. Supporting insulators
路面是指铺设在( )顶面的层状结构。
A. 土基
B. 路基
C. 垫层
D. 基层
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