Two vessels（）while they „re sailing in Huangpu River.

（）all ships in a large sea area being alerted, an “area call” will normally be transmitted so that only those ships in the vicinity of the distress incident are alerted.

A.Avoiding
B.To be avoided
C.Avoided
D.To avoid

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The concept of NAVTEX is of a（）system for the broadcast and reception of MSI.

A.complete service
B.partial controlled
C.quite new
D.total co-ordinated

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