单选题 A ship fitted with an MF radio installation shall, while it is at sea, maintain a continuous watch on ______.
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单选题 The GMDSSis a world-wide communication network combining ______ with ______.
单选题 The GMDSS is composed of ______.
单选题 GMDSS is the abbreviation of ______.
单选题 The GMDSS is composed of ______.
单选题 Which statement is false regarding a GMDSS-equipped ship?
单选题 The GMDSS defines four sea areas based on the ______.
单选题 What is the primary purpose of the GMDSS?
单选题 The communication system used by the GMDSS includes ______.