【单选题】[8-8]How many operators are needed/required on board according to the provisions of the International Convention for the Safety of Life at Sea,1974 ___. 根据SOLAS 公约(1974)的条款要求,船上应有()个操作员
【单选题】[8-1]According to SOLAS the breathing air apparatus that must be onboard shall have sufficient capacity for how many minutes of operation?___根据SOLAS公约,船上必须配备的呼吸器装置应该具有足以支持多少分钟操作的能力?30分钟.