单项选择题
On notification by Admiralty Notice to Mariners that a new edition of one of the books，or a new supplement to one，has been published，it should be obtained（）.
A.as soon as possible
B.prior to its publication
C.in advance of any possible accident
D.by means of other than airmails
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A.broadcast
B.broadcasted
C.are broadcast
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（）is the system for the broadcast and automatic reception of maritime safety information by means of narrow-band direct-printing telegraphy.
A.SafetyNET
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