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单选题
1027、If you install the upper drag strut incorrectly,it will hit the lower drag strut during retraction.
A
The removal of the upper drag strut has to be done properly so that the lower one can fully extend.
B
The correction installation of the upper drag strut can prevent the retraction of the lower drag strut.
C
If the upper drag strut is installed improperly, the lower one will be hit during retraction.
答案解析
正确答案：C
解析：
解析:incorrectly=improperly 错误地;不适当地。upper 和 lower 互为反义词。
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