5 seconds
10 seconds
15 seconds
20 seconds
第1题：
How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?
A.With gooseneck vents
B.With warning signs
C.With flame screens
D.With pressure-vacuum relief valves
第2题：
The sign used to caution persons approaching the gangway of a tank barge during cargo transfer reads ______．
A.Warning，Keep Off，Stay Clear
B.Danger，Do Not Board
C.Warning，No Smoking，No Open Lights，No Visitors
D.Dangerous Cargo Being Transferred
第3题：
If the warnings ________, the engine cuts out and the hazard warning lights go on.
A gounheeded
B gounheededly
C gotobeunheeded
D gounheeding
第4题：
AS系统里，表示主要告警的是：
第5题：
当前民航使用频率间隔是25kHz，当R/SXU250A出现以下哪个告警不影响工作（）
第6题：
Open ullage holes in tanks which are not gas-free must be protected by ______.
A.PV valves
B.warning signs
C.flame screens
D.stop-check valves
第7题：
第8题：
One of the two systems established by GMDSS for the transmission and automatic receipt of Maritime Safety Information is______．
A.Initial Distress Alerts service
B.Navigational Warning service
C.INMARSAT Safety Net service
D.Meteorological Warning service
第9题：
While setting up the threshold for tablespace space usage metrics for one of your tablespaces， you define the critical threshold as 60% and warning threshold as 75%. What would be the result of this setting？（）
第10题：
爱立信OSS告警管理中，告警级别有（）