同一种滚筒直径又有几种不同的轴径和中心跨距供设计者选用。
One drum diameter has varied diameters of shaft and central spans so that the designers may have choice.
里奥哈特认为，组合混凝梁土对于三跨距的悬索拉桥来说也是十分经济的，不过仅限于中心跨度为700米以内的拉桥。
According to Leonard, the composite concrete deck is also economical for triple-span cable-stayed suspension bridges, but only for those with a center span of up to 700 meters.
接下来对宽带雷达下目标的多散射中心回波模型进行了仿真，验证了目标跨距离单元走动规律，并对目前常用的宽带雷达检测方法进行了仿真和比较；
A method of moving target detection in wide-band radar is then advanced basing on the MTCI algorithm, and the feasibility of the method is validated by simulation and experiment data.
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