许多开启器是用磁铁或夹具来夹紧要开启的盖子。
Many openers have a magnet or set of clamps to grip the open lid.
介绍了模具夹紧器的结构、工作原理和性能改进设计。
Structure, working principle and improvement on performance of die clamps have been introduced.
可以选用不同的张紧装置，比如夹紧器等。
Different tensioning devices are available, such as clamping devices.
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