国家用于人民防空通信的专用频率和防空警报音响信号，任何组织或者个人不得占用、混同。
No organizations or individuals may use the same frequency or the same acoustic signals as those specially used by the State for civil air defense communications or air defense warning.
另外一些软件则无需占用很少资源，因为它们在漫游过程中随时下载，但是这需要用户具备良好的手机或者Wi-Fi无线信号，至少在导航开始的时候。
Others are much slimmer, because they download the apps on the fly, but these require you to have good cellular or Wi-Fi coverage at least at the start of a navigation session.
在高帧率超声成像算法中，对回波信号进行有限衍射波束加权处理占用了成像中大部分计算时间。
In the a high frame rate (HFR) ultrasonic imaging system, the weighting process by limited diffraction beams on echo signal takes the most of the calculation time for constructing an image.
应用推荐