back-to-back duplex bearing

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1.	成对双联轴承请问bearing的... ... back bearing 反象限角 back-to-back duplex bearing 成对双联轴承(外圈宽端面相对) ball bearing 滚珠轴承 ... zhidao.baidu.com
2.	背靠背成对安装轴承滚动... ... Back-to-back duplex bearing 背靠背成对安装轴承（外圈宽端面相对） Ball and roller bearing 滚动轴承，球和滚子轴 … blog.sina.com.cn