A hand held instrument used to measure distances between objects and the ship is a（）.

A large valve，usually installed above the ram preventers，that forms a seal in the annular space between the pipe and wellbore or，if no pipe is present，on the wellbore itself is called the（）.

An inert gas system on a tanker should be used to（）.

A fishing vessel casualty must be reported to the Coast Guard if it involves（）.

A fire has broken out on the stern of your vessel. You should maneuver your vessel so the wind （）.

All ships（）suspected infectious disease on board should radio information to Port Health Officer.

A frame with two，or sometimes four，arms through which are threaded the guidelines and which is used to keep the drill stem and bit in line with the center opening in the temporary guide base is the（）.

How could lashing gear used aboard Ro-Ro vessels be stowed when not in use? （）

A fishing vessel displaying the lights shown is（）.

For the purposes of cargo oil containment，the fixed container under the manifold of an eight-inch loading line must hold a minimum of（）.