Inspection and maintenance shall be conducted once every five days to control the performance of elevator operation.
天为一个周期的巡回检查和维护，控制电梯运行质量。
To ensure the normal operation of supplier quality system once every six months to monitor the quality system.
为确保供应商质量体系运转正常每半年进行一次质量体系监察。
To ensure the normal operation of supplier quality system once every six months to monitor the quality system.
为确保供应商质量体系运转正常每半年进行一次质量体系监察。
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