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单选题
适航部分必须规定每个强制更换时间。
A
The airworthiness section may recommend each expected replacement time.
B
The replacement time must be set forth in part of airworthiness section.
C
Airworthiness section must set forth each mandatory replacement time.
答案解析
正确答案：C
相关知识点：
适航规定强制更换时间，选airworthiness...time
