A new backfire antenna fed by a bifilar backfire belix is described in this Paper.本文提出一种用双线背射螺旋作馈源的新式背射天线.Loads distort every component of the structure of the Cassegrain antenna system.载荷使卡塞格伦天线结构的每个部分发生变形.The microstri...
The light bulb has a resistance of 120 ohms.灯泡有120欧姆的电阻.When resistance in the circuit exceeds 230 ohms, the reading is not completely dependable.网路电阻超过230欧姆时，读数就完全不准了。We shall take the typical emitter - to - base resist...
土壤的采样使用芯形采样器.Soil is sampled with a core sampler.为了保持样品沉积物的层次结构, 就要用空心铁管采样器.To take samples that retain the larger structure of the sediment, a core sampler is used.我国降水自动采样器的现状 、 存在的问题和今后的发展趋势.The status, constraints an...