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单选题
《《飞行员操作手册》》应该作为对飞行员最有用的操作参考书。
A
The Pilots Operating Handbooks are the most useful as a pilots’ maintenance reference book.
B
The Pilots Operating Handbooks as pilots’ operation reference book should be most practical.
C
The Pilots Operating Handbooks should be of maximum usefulness as an operation reference book for pilots.
答案解析
正确答案：C
