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.
我们想买一台湿背式锅炉。
高速公路构造物台背回填质量关系到高速公路整体质量。
The quality of freeway structure retailing backwall refilling concerns the freeway global quality.
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