... 槽钢胀圈channel steel expansion ring 环口collar extension 局部变形local distortion ...
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neck opening
The extension and promotion of higher vocational education have been an important part of our country's education system and the hatcher of "high Blue Collar".
作为中等职业教育延伸与提高的高等职业教育业已成为我国教育体系的重要组成部分，成为培养“高级蓝领”的重要孵化器。
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