问题：
[单选题]In the International Code of signals，a group of three letters indicates（）.
A、urgency or an emergency
B、the vessel's national identity signal
C、a group from the general signal code
D、a group from the medical signal code
参考答案：
D
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- ● When a veel ignal her ditre by mean of a gun or other exploive ignal，the firing hould be at interval of approximately（）.
