对上颌第三 前臼齿, 在颊侧和舌侧齿尖以及分隔两个齿尖的咬 合面中央沟(central groove) 两侧各确定两个标志点. 标志点-1: 颊侧齿尖顶端; 标志点-2: 近中颊侧沟 (mesiobuccal groove)与中央沟的交点; 标志点-3: 舌 侧齿...
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Integral spiral heavy weight drill pipe is to extend the central upset of heavy weight drill pipe and to cut spiral groove on heavy weight drill pipe.
整体螺旋加重钻杆是在整体加重钻杆的中间加厚部位延长并铣削螺旋槽。
It acts as the LPF, effectively eliminating the high frequency component in the feed-in signal. The groove in the central region working as a loading capacitance in the open end is also discussed.
高频扼流圈是一段未闭合的铜,和其终端等效的边缘电容形成一个低通滤波器,可以有效地滤除馈入信号中的高频成分。
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