portal type是什么意思 portal type怎么读
portal type的用法和样例
- The portal frames are joined at the top by a cross member.
在门形框架顶部使用一个横撑相连。 - Dynamic characteristics of the portal frame are also identified from the WPT of low frequency signals.
低频的部分则可以进行门形构架的系统识别。
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