International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.

Every ship constructed on or after（）shall comply with a...

单项选择题Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.

In case a ship is in emergency or distress in any of 4 ...

单项选择题In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.

Radio beacon can be activated（）in case of distress.A.on...

单项选择题Radio beacon can be activated（）in case of distress.