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问题详情

If a ship station relays a DSC distress call to an appropriate coast station, it means that（）.

A、the ship has received the DSC distress call on a HF frequency

B、the coast station concerned has not acknowledged it within 5 minutes

C、the ship will take command of search and rescue in 5 minutes

D、A and B

时间：2022-01-04 04:30 关键词： GMDSS

答案解析

D

相关问题

The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.
All stations which receive a distress alert shall immediately cease（）.
下列程序执行后，变量a的值为( )。 Dim a,b,c,d as single a=100 b=20 c=1000 if b＞a Then d=a:a=b:b=d End if if c＞a Then d=a:a=c:c=d End if if c＞b Then d=b:b=c:c=d End if
若变量已正确定义，有以下程序段： int a=3,b=5,c=7； if(a＞B)a=b;c=a； if(c!=A)c=b； printf("%d,%d,%d ",a,b,C)；其输出结果是( )。
若变量已正确定义，有以下程序段 int a=3，b=5，c=7； if(a＞B) a=b； c=a； if(c!=A) c=b； printf("%d，%d，%d "，a，b，c)；其输出结果是