[矿业]?张紧千斤顶
... 詹姆斯摇床 James concentrator 张紧千斤顶 tension jack 侦察探孔 scout hole ...
液压式张拉机检定规程
As NPR's Jack Speer reports, tension between the company and its workers is heating up.
NPR: Delphi Asks Judge to Void Labor Contract
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