There are three wave movements sin3t, sin4t and sin5t. According to the Nyquist sample principle, we need set the sample interval ∆t as ( ) to identify the three kinds of movements at the same time. ( )
【简答题】关于“可仅将柱四角纵筋伸至筏形基础中间层钢筋网片上,其余纵筋锚固在基础顶面下laE即可”的条件,下列说法正确的是( )。A. 轴心受压柱,基础顶面至中间层钢筋网片距离≥1200mm; B. 小偏心受压柱,基础高度≥1000mm; C. 小偏心受压柱,基础顶面至中间层钢筋网片距离≥1200mm; D. 大偏心受压柱,基础高度≥1200mm; E. 大偏心受压柱,基础顶面至中间层钢筋网片距离≥1400...