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单选题
尤其是对飞机地面操作有用的主要尺寸，应当在图纸上显示出来
A
Principal dimensions, particularly those useful for handling the airplane, shall be shown upon the drawing.
B
Particularly those useful for flying the airplane, shall be shown in the drawing.
C
Principal dimensions, useful for maneuvering the airplane, shall be particularly shown upon the drawing.
答案解析
正确答案：A
