634.If you install the upper drag strut incorrectly, it will hit the lower drag strut during retraction( )

　The correction installion 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 wil be hit duringretraction.

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

正确答案：B

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