单选题 What must be entered, after the Shore ID and“#” sign is entered and a ring- back tone is heard, to obtain the intervention of the telephone operator in the IN-MARSAT Standard-F service?
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单选题 Which statement is false regarding a GMDSS-equipped ship?
单选题 The GMDSSis a world-wide communication network combining ______ with ______.
单选题 The GMDSS defines four sea areas based on the ______.
单选题 The GMDSS is composed of ______.
单选题 The communication system used by the GMDSS includes ______.
单选题 What is the primary purpose of the GMDSS?
单选题 The GMDSS is composed of ______.
单选题 GMDSS is the abbreviation of ______.