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[单选] What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? ()

A . No action is necessary,as the DSC control unit will automatically switch to the NBDP follow-on communications frequency
B . The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received
C . The Operator should immediately set continuous watch on VHF channel 70
D . The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received

What is the basic concept of GMDSS? () Search and rescue authorities ashore can be alerted to a distress situation。 Shipping in the immediate vicinity of a ship in distress will be rapidly alerted。 Shoreside authorities and vessels can assist in a coordinated SAR operation with minimum delay。 All of the above。 出生时已存在,永不消失的神经反射是() 角膜反射。 瞳孔反射。 结膜反射。 咽反射。 颈肢反射。 易致疮疡、下痢、湿疹的邪气是() 火邪。 湿邪。 风邪。 燥邪。 新时期中小学思想道德教育中德育的目标追求是:() 学会做人。 学会学习。 学会选择。 《生产安全事故报告和调查处理条例》规定,一次生产安全事故造成1.1亿元的直接经济损失,属于什么事故? What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? ()
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