单项选择题
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
A.1 February 1995 B.1 February 1992 C.1 July 1997 D.1 February 1999
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.
单项选择题 Radio beacon can be activated（）in case of distress.
单项选择题 If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
