26.Which the system that SELCAL system must through it realize SELCAL function?选择呼叫系统必须通过哪个系统才能实现其呼叫( )

　VHF or VOR systems.VHF或VOR系统

　HF or ADF systems。HF或ADF系统

　HF or VHF systems.HF或VHF系统

正确答案：C

解析：

题目解析这个问题涉及到SELCAL系统如何实现其呼叫功能。正确答案是C，必须通过HF或VHF系统来实现SELCAL功能。SELCAL（Selective Calling，选择性呼叫）是通过HF或VHF通信系统中的特定频率和编码来实现的，因此这两个系统都是实现SELCAL功能所必需的。

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