A.三角網(wǎng)B.多邊形網(wǎng)C.矩形網(wǎng)D.正方形方格網(wǎng)E.三維網(wǎng)
A.80B.90C.100D.110
A.安全可靠B.揚(yáng)壓力大C.施工方便,便于機(jī)械化施工D.樞紐泄洪容易解決,便于樞紐布置