对有限移动源等问题也作了必要的讨论。
The problem on the limited moving source are also discussed.
钰源机械配件有限公司的电缆滑车轴承为球面接触，滑车运行始终保持线接触使小车的移动灵活、稳固、均匀，故障率极低。
Cable pulley bearing Yuyuan Machinery Fittings co. Ltd. is a spherical contact block operation always maintain line contact and make the car mobile and flexible, stable, uniform, low failure rate.
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