妨碍物,阻碍者;
For the same line with obstructor at the user's terminal the attenuation of carrier signal is weak, when transferring distance is 30km, the applicable frequency range is 0.1~ 200kHz.
当用户处有阻波器时,载波信号衰减很小,在30km范围内可用频段为0.1~200kHz。
Repair of half maxillary bone defect applying magnetic attachment and non-root obstructor
应用磁性附着体及无顶式阻塞器修复半侧上颌骨缺损
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