单项选择题

What is defined as the area within the radiotelephone coverage area of at least one VHF coast station in which continuous DSC alerting is available as defined by the IMO regulation for GMDSS?

A.Ocean area regions AOR-E, AOR-W, POR or IOR.
B.Sea area A1.
C.Sea area A2.
D.Coastal and inland waters.
微信扫码免费搜题