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单选题
1117. If you install the upper drag strut incorrectly, it will hit the lower drag strut during retraction.
A
The correction installation of the upper drag strut can prevent the retraction of the lower drag strut.
B
If the upper drag strut is installed improperly,＇ the lower one will be hit during retraction.
C
The removal of the upper drag strut has to be done properly so that the lower one can fully extend.
答案解析
正确答案：B
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