单项选择题

After reporting a casualty to a mobile offshore drilling unit，which record must be retained on board? （）

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

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单项选择题
After putting on a self-contained breathing apparatus，you open the air supply and hear a continuous ringing of a bell. What does this mean? （）

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
According to the Chemical Data Guide，epichlorohydrin is a(n)（）.

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