Aircraft bolts.2.SAE 4130 chrome/molybdenum tubing.3.Spring steel struts.4.Most heat-treated steel/nickel alloy components.

发布于 2021-02-18 18:20:40
【单选题】
A only in certain instances where the primary load is shared by one or more other original structural member.
B if the same quality wood is used in both.
C only upon specific approval by the manufacturer or the FA A.

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