Which device provides the main means in the GMDSS for locating ships in distress or their survival craft().
GMDSS完全实施后,凡配备有MF/HF无线电设备的船舶应在()上保持连续值守。
下面的哪一项不是GMDSS新引进的通信技术?()
航行在A3、A4海区的船舶,可采用()方法保证GMDSS设备可用性.
What is the basic concept of GMDSS? ()
GMDSS is to provide()with reliable communication .
In the GMDSS, distress alerting can be transmitted in()directions.
关于GMDSS船舶在航行期间对设备的工作要求,下列叙述不正确的一项是()。
Which statement concerning reserve sources of energy for GMDSS is FALSE().
The purpose of the GMDSS is to()safety of life and property at sea all over the world.