单选题

Install packing and backup rings on bearing. Slide bearing into cylinder until bottomed.
在轴承上安装填料和支撑环。将轴承滑入气缸直到底部。

AInstall packing and support rings on bearing Glide bearing into cylinder until it is bottomed.

BInstall packing and backward rings on bearing. Slash bearing into cylinder until the bottom is visible

CInstall packing and alternative rings on bearing. Skid bearing into cylinder until you see the bottom.

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正确答案：A （备注：此答案有误）

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