29.How many service interphone Jack there have?服务内话插孔共有( )

　Seven 7个

　 Eight 8个

　Thirteen 13个

正确答案：C

解析：

题目解析问题问的是有多少个服务内话插孔。正确答案是C. 十三个。这是因为飞机上有多个位置需要通信，例如驾驶舱、乘务员站、客舱等，因此需要多个插孔来支持这些通信需求。

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