... guide lip 导向挡边 guide lug 导耳; 导缘; 履带板齿 guide margin 导边数据孔间距; 导向边宽度; 引导边缘; 引导余量 ...
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导叶操作机构主要包括：导叶臂压板、导叶臂、分瓣键、连接板、耳柄、剪断销、连杆销及压盖等。
Guide vane operation structure includes the guide vane arm clip board, guide vane arm, segmental keys, connection board, handle, cut pin, connecting rod pin and gland, etc.
一耳正常、另耳为传导性聋，测试患耳骨导时不需掩蔽；
When one ear normal and the other is the conductive impairment, need no masking when testing the diseased ear.
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