安装活塞环的凹槽称为活塞环槽。
譬如螺栓是否拧紧，活塞环安装是否正确，损坏油封是否更换等。
Such as whether the bolt is tightened, the piston ring is installed correctly, damaged oil seal is replaced, etc.
安装在环槽中的活塞环有两种类型：压缩环和机油环。
The piston rings carried in the ring groove are of two basic types: compression rings and oil-control ring.
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