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飞机结构的适航性要求有哪些？

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在飞行过程中机翼受到哪些载荷作用？

Fill the blanks with the words in this unit and pay attention to the correct forms (first letter of words are given):The prime minister said firmly that the problem of the territory is not n_________.

Throughthis,a singleeventoreventsequencecan t_______ a series ofasynchronousactivities.

Thesemeasureswillhelpusd_______militaryrisk,actbeforecrisesandconflictserupt,andensure thatgovernmentsarebetter abletoservetheirpeople.