单项选择题
The radiotelephone safety signal is（）.
A.securite repeated 3 times B.safety repeated 3 times C.pan pan repeated 3 times D.securite securite repeated 3 times
单项选择题 One of the signals，other than a distress signal，that can be used by a rescue boat to attract attention is a/an（）.
单项选择题 On offshore drilling units，each EPIRB or SART must be tested once every（）.
单项选择题 How can vessel personnel detect the operation of a SART in its vicinity?（）
