rigid spread foundation的意思|示意

刚性扩大基础 ... rigid frame foundation 刚构基础 rigid spread foundation 刚性扩大基础 rigid strip foundation 刚性条形基础 ...

刚性扩展基础 ... 刚性开关调制器 hard-switch modulator; 刚性扩展基础 rigid spread foundation; 刚性离合器 positive clutch; positive-acting clutch; sleeve clutch; ...