这种空压机气缸中基本上不含油，其活塞环和填料一般为聚四氟乙烯。
This kind of air compressor cylinder basically does not include any oil content in, the piston ring and packing is commonly ptfe.
回填料采用机械运输，夯实采用蛙式夯机或立式夯机进行夯压，允许的情况下采用碾压机进行压实。
The backfill shall be transported with machine and rammed with a frog rammer or a vertical rammer, or rammed with a roller in case of allowable situation.
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