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closing ratio
dril.
井喷压力与防喷器关闭压力之比
oil
防喷器工作压力与关闭芯子操作液压比
;
关井比
;
井喷压力与关闭芯子
闸板
操作液压比
tech.
配量比
closing ratio
:
1 phrase
in 1 subject
Technology
1
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