新电梯中国网讯 TSG GT5002-2017电梯维护保养规则规定了维保单位设立24小时值班电话。
Thee elevator maintenance rules of TSG T5002-2017 have required that maintenance companies should be equipped with 24-h duty calls.
新电梯中国网讯 TSG GT5002-2017电梯维护保养规则规定了维保单位设立24小时值班电话。
Thee elevator maintenance rules of TSG T5002-2017 have required that maintenance companies should be equipped with 24-h duty calls.
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