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单选题
针对无限制数量叶片前缘叶尖卷曲描述哪个不正确
A
The tip curl does not extend more than 0.5 inch (12.7 mm) across the blade tip
B
The tip curl does not extend more than 0.5 inch (12.7 mm) down the leading edge.
C
The maximum deflection from the initial contour is not more than 0.25 inch (6.3mm）
D
The angle of the deflection is not more than 75 degrees
答案解析
正确答案：D
