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单选题
548.Basically, it is a guide to industry standardization of proven
548.Basically, it is a guide to industry standardization of proven
concepts to be presented in a form most useful to pilots.
A
Secondly, it is a guide to industry standardization of proven conceptsto be presented in a form most useful to pilots.
B
Basically, it is a guide to industry standardization of providedconcepts to be presented in a form most useful to pilots.
C
Mainly, it is a guide to industry standardization of proven conceptsto be presented in a form most useful to pilots.
答案解析
正确答案：C
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