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Sheet metal construction, with a removable outer fragmentation sleeve.
金属板材建设，具有可移动外部碎片套。
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The upper end of the outer lower rod is connected to an upper rod sleeve.
在外部低杆的上端连接到一个上杆套。
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The upper end of the outer lower rod is connected to an upper rod sleeve.
在外部低杆的上端连接到一个上杆套。
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