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单选题
顶部所有垂直的主固定支柱都是可调节的。但是,调节主安装座支柱是不需要的,除非修理或更换支柱。在更换APU时，备用的垂直支柱(左前侧)和备用的侧支柱(右前侧)可能需要调节。
A
All of the top vertical mounting struts are adjustable except the primary mount struts unless they are repaired or replaced. The spare vertical strut (left forward ) and the side strut (right forward) may require adjustment during APU replacement.
B
All of the vertical primary mount struts at the top are adjustable. However, adjustments to the primary mount struts are not required unless a strut is repaired or replaced. The redundant vertical strut (forward left) and the redundant side strut (forward
C
The top of every vertical main retaining struts is adjustable. However, adjusting the main mount strut is not allowed if the strut is not repaired or replaced. During APU replacement, it may be necessary to adjust remained vertical strut (left anterior) a
答案解析
正确答案：B
相关知识点：
支柱调节情况要知晓
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