单项选择题

After sending a message describing the symptoms of an ill crew member，you receive a message containing the code MRL. This means “（）”.

A.Apply ice-cold compress and renew every 4 hours
B.Commence artificial respiration immediately
C.Give enema
D.Pass catheter into bladder

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单项选择题

A.Record of drafts
B.Hull reports
C.Anchor record
D.Machinery repair book

单项选择题

A.The unit is working properly
B.The face mask is not sealed properly
C.The air bottle needs to be refilled
D.The air supply hose has a leak

单项选择题

A.corrosive
B.class B poison
C.oxidizer
D.explosive