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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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大多数活塞的顶部有3个活塞环槽。
Most pistons have three ring grooves at the top.
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大多数活塞的顶部有3个活塞环槽。
Most pistons have three ring grooves at the top.
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