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能够详细说明工件夹持装置，如三爪和夹具。
Capable of specifying work-holding devices such as jaws and fixtures.
youdao
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分离式液压三爪拉马；
Separating type Hydraulic Three-Jaw Puller;
youdao
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但是我读了许多书，看到过4张图片三爪卡盘。
I have however read a lot of books and have seen pictures of 4-jaw chucks.
youdao