... 履带支面 ground contacting area of track; 履带支托轮 upper track wheel; 履带主链节 master track link ...
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upper track wheel 履带支托轮; 托带轮...
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The local stress in the box beam is caused by the wheel pressure of the trolley conveyed along the track onto the upper flange and the web of the beam.
起重机小车轮压经轨道传给箱形主梁上盖板和腹板，使之产生局部应力。
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