Many areas in China have studied on the right preventive maintenance time and maintenance measures in recent years.

近年来，我国多个地区开展了预防性养护时机和养护措施的研究。

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Many areas in China have studied on the right preventive maintenance time and maintenance measures in recent years.

近年来，我国多个地区开展了预防性养护时机和养护措施的研究。

youdao