天为一周期的维护、保养，专业维保人员严格按公司《维保管理制度》和《维保作业指导规范》实施。
Professional maintenance staff shall maintain the elevator for once every 15 days, sticking to the Management System of maintenance and the Standard of maintenance Guidance.
天为一周期的维护、保养，专业维保人员严格按公司《维保管理制度》和《维保作业指导规范》实施。
Professional maintenance staff shall maintain the elevator for once every 15 days, sticking to the Management System of maintenance and the Standard of maintenance Guidance.
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