发射无方向信号的无线电信标台。据此飞行员能够用自动定向仪 （ADF ）确定他的背台或向台方位。
A radio beacon which transmits nondirectional signals whereby the pilot can use the ADF to determine his bearing to or from the station.
针对公路工程中的桥涵结构物台背回填从材料选择、回填范围、回填顺序及回填工艺、质量控制等方面进行论述，并说明台背回填重要性。
This paper specified the material filling, range filling, sequence construct technique, and quality control on back - filling at abutment , and the importance of it.
介绍了采用10%水泥碎石稳定集料挤密桩加固已施工结束的台背回填土体的挤密原理、设计方案、施工要求及质量控制。
The compaction principle, design scheme, construction demand and quality control of bridge abutment backfill reinforcement using compaction piles that are stabilized with10%cement are introduced.
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