Maintenance shall be done by person having elevator operation certificate;
维保操作必须由持有电梯操作证的人来完成；
Simple elevator with electric hoist as power unit features low cost and ease of operation.
以电动葫芦为动力装置的简易升降机造价低廉，使用方便，但缺少明确的设计安装标准。
The elevator mechanism has simple operation and convenient regulation.
上述升降机构操作简单、调整方便。
The elevator mechanism has simple operation and convenient regulation.
上述升降机构操作简单、调整方便。
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