单项选择题
On offshore drilling units，each EPIRB or SART must be tested once every（）.
A.day B.week C.month D.year
单项选择题 How can vessel personnel detect the operation of a SART in its vicinity?（）
单项选择题 How can the SART’s audible tone monitor be used?（）
单项选择题 How can rescue personnel detect that a SART is transmitting in the immediate vicinity? （）
