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英语高手请进,foundationboltpocket是什么意思原句是这样,slipperplatesshouldbepositionedontheconcretesurfaceat-8.747mlevel,eithersideofthefoundationboltpocket,andgreaseappliedtoaidjacking.foundationbolt是地角

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英语高手请进,foundation bolt pocket是什么意思
原句是这样,slipper plates should be positioned on the concrete surface at -8.747m level,either side of the foundation bolt pocket,and grease applied to aid jacking.foundation bolt 是地角螺栓的意思,那么foundation bolt pocket指的是哪部分,高手请赐教.
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地角螺栓凹槽