采用螺旋形结构的脉冲形成线能在形成同样脉冲宽度的前提下大大缩短形成线的长度。
It can reduce the length of the pulse forming line on the premise of forming the same output pulse width to adopt a helical structure.
目的：探讨螺旋形导针配合双侧斜位X线片判断颈椎椎弓根螺钉置入孔道准确性的可行性。
Objective: To evaluate the accuracy of cervical pedicle screw pilot holes placement by bilateral oblique X-ray films with the spiral wires as the guide pin.
结果表明，活塞杆在磁粉探伤中显现的螺旋形磁粉堆积线是由热处理缺陷一屈氏体软带造成的。
The result proves that the accumulate line is caused by heat treatment defect, soft troostite tape.
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