单项选择题

When should the emergency position-indicating radio beacon be activated after abandoning an OSV ________．
A.Immediately
B.After one hour
C.Only when another vessel is in sight
D.Only after sunset

A.A.Immediately
B.After
B.Only
C.Only
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单项选择题
图示结构中，下列关于B、C点竖向变形数值的描述，何项正确？
A.
B.
C.
D.无法判别
单项选择题
When your vessel is proceeding to the area of traffic density，______ is used to determine the exact ranges of other ships or objects in the vicinity．A.RadarB.GPSC.DFD.Satellite Navigator
A.A.Radar
B.GPS
C.DF
D.Satellite
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