1027、If you install the upper drag strut incorrectly,it will hit the lower drag strut during retraction.

　The removal of the upper drag strut has to be done properly so that the lower one can fully extend.

　The correction installation of the upper drag strut can prevent the retraction of the lower drag strut.

　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:注释: incorrectly=improperly 错误地;不适当地。upper 和 lower 互为反义词。

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