單項(xiàng)選擇題How long must the GMDSS radio log be retained on board().

A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry


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1.單項(xiàng)選擇題Each satellite broadcasts()traffic on a designated channel.

A.LES
B.ESA
C.NCS
D.EGC

2.單項(xiàng)選擇題At sea,all required GMDSS equipment(other than survival craft equipment)must be proven operational by().

A.daily testing
B.either A or C
C.operational use of the equipment
D.testing at least every 48 hours

4.單項(xiàng)選擇題() is not required by bridge-to-bridge communications.

A.VHF
B.SART
C.NAVTEX
D.LES