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【单选题】
悦动轿车发电机整流器有几个励磁二极管？A.
3
B.
6
C.
9
D.
12
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皮皮学刷刷变学霸
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A.
Direct performance of deck or engine operations in a scheduled and fixed rotation
B.
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C.
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D.
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A.
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B.
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C.
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A.
direct performance of deck or engine operations in a scheduled and fixed rotation
B.
performance of maintenance work necessary for the vessel's safe operation，on a daily basis
C.
performance of lookout duties
D.
direct performance of cargo loading and discharge operations only
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