单项选择题
A.opening dead spaces to check for heat or fire
B.evacuation of the vessel
C.sounding the "all clear" signal
D.operation of the emergency generator
单项选择题 On offshore drilling units，emergency lighting and each emergency power system must be tested at least once a（）.
单项选择题 It is the responsibility of the Master or person in charge of a ship to ensure that（）.
单项选择题 In each inflatable liferaft，what equipment is provided to make quick，emergency，temporary repairs to large holes in the raft? （）