单项选择题

A、正确
B、错误

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单项选择题

In the mainbody part of an application letter for studying abroad, it is to ( ).
A、explain the purpose of the letter (the reason for the application) , the source of information, knowledge about the school and your own plans.
B、express your desire in a confident and firm tone.
C、introduce your background, including age, profession, education, work experience, qualifications, specialties, interests, etc..
D、state the nature of the application or the type of degree to be applied for and when to enroll.

单项选择题

下列有关机翼结构形式选择说法正确的是
A、由于机翼的扭转刚度非常重要，所以结构形式的选择主要由机翼扭转刚度决定
B、相对载荷和翼面载荷指数都与翼面弯矩相关，所以机翼结构形式的选择主要有弯矩大小和翼面高度决定
C、机翼结构形式的选择由所选用的材料及其工艺决定
D、机翼结构形式的选择主要由飞机的功能决定