C&M care and maintenance 维修及保养 ; 维修及调养
O&M Operations and Maintenance 运行和维护
D&M Driving and Maintenance 驾驶与维修
O&M Operation and Maintenance 运行和维修 ; 操作维护
Operation & Maintenance O&M 操作与维护
OAM M Operation and maintenance 操作和维护
Operation and Maintenance Contract O&M 经营和维护
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