单项选择题
A.Let go of both control levers and return to neutral position
B.Press the emergency stop
C.Notify the mate on watch
D.All of the above
单项选择题 Which action(s) is/are included in crane operations?（）
单项选择题 Where must the 0mster or person in charge of a ship record the date of each test of emergency lighting and power systems and the condition and performance of the equipment?（）
单项选择题 When will the float-free emergency position indicating radio beacon be activated after abandoning ship?（）