The Russian carrier Aeroflot recently withdrew its Tu-154 fleet from service, largely because the planes do not meet international noise restrictions and use too much fuel.
俄罗斯航空公司最近退出服务的图- 154机队，主要是因为飞机不符合国际噪音限制和使用太多的燃料。
2
The effect of thermal noise and vehicle dynamics on carrier tracking loop are also analyzed, and the optimal bandwidth of carrier tracking loop is obtained.
并以相位跟踪环路为例分析了热噪声及载体动态性对环路的影响，得出了环路设计的最佳带宽。
3
The phase noise is usually specified, depending on the carrier offset, as a single-sideband phase noise referenced to the carrier offset.