单选题What is the requirement of a navigator who used an ECDIS?（）AGood navigational knowledge and a professional job attitudeBGood computer knowledgeCGood system knowledgeDNothing special
单选题
What is the requirement of a navigator who used an ECDIS?（）
A
Good navigational knowledge and a professional job attitude
B
Good computer knowledge
C
Good system knowledge
D
Nothing special
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解析：
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