mechanic jar
... mechanic jar 机械震击器 mechanic 机械工；机械的 mechanical abrading device 机械清除装置 ...
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... Lead stem铅加重杆 link jar机械震击器 tubular jar管状震击器 ...
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震击器主要有两类：液压震击器和机械震击器。
There are two primary types, hydraulic and mechanical jars.
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除按照机械和液压分类以外，震击器还可以分为钻井用震击器和打捞用震击器。
In addition to the mechanical and hydraulic versions, jars are classified as drilling jars or fishing jars.
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