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117trACk

117. flanged cup bearing外环凸缘轴承118. flexible bearing挠性轴承119. ...8. 挡圈型滚轮(滚动)轴承 yoke type track roller (rolling bearing) 装有一...

ng-repeat="item in item track by $index" --(track by $index) 可以by其他元素;默认循环都会产生元素唯一id最为轨道; 数组循环出现重复性id,让他按照$index...

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