单选题A preventer guy（）.Aprevents anyone from working the cargo at unauthorized timesBis a safety measure in case one of the outboard guys partsCis a longshoreman who watches for accidentsDis the same as a blacksmith
单选题
A preventer guy（）.
A
prevents anyone from working the cargo at unauthorized times
B
is a safety measure in case one of the outboard guys parts
C
is a longshoreman who watches for accidents
D
is the same as a blacksmith
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