单选题（）(所有船员) must know the locations as well as the operations of the life-saving and fire-fighting appliances.AAll officersBAll engineersCAll the crewDAB and C
单选题
（）(所有船员) must know the locations as well as the operations of the life-saving and fire-fighting appliances.
A
All officers
B
All engineers
C
All the crew
D
AB and C
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