单项选择题
A.insulate your shoes
B.ground the fire hose
C.secure its power supply
D.start the fire pump
单项选择题 While working in the engine room, you hear seven short blasts followed by one long blast on the ships whistle, supplemented by the same signal on the general alarm bellsYou should （）.
单项选择题 All personnel should be familiar with the lifeboats （）
单项选择题 The necessity for administering artificial respiration may be recognized by the victims （）.