If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies, which frequency should you call on ?______.
A.Calling frequency
B.Distress frequency
C.Urgency frequency
D.Working frequency
正确答案：D
如果你知道你船在甚高频上呼叫保持工作和职守频率你将呼叫哪个频率？工作频率
