单选题An illness preferably of an infectious nature seizin more than two persons on board at the same time defines（）.Adisease of crewBcrew illnessCgroup illnessDmass disease
单选题
An illness preferably of an infectious nature seizin more than two persons on board at the same time defines（）.
A
disease of crew
B
crew illness
C
group illness
D
mass disease
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