房间的是平整的地面并做舞会以及音乐会使用。
The rooms had flat floors and were used for balls as well as for concerts.
当通过不平整的地面时，担架要有四人抬，并尽量保持水平。
When crossing uneven ground, a stretcher should be carried by four people and kept as level as possible.
操作注意事项：1、升降机必须放置在坚实平整的地面上，以防工作时倾翻。
Operation note: 1, the lift must be placed on a firm and flat, in order to prevent the work when tipping.
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