Bilge keels are fitted on ships to（）.

单项选择题A wildcat is a（）.

A.deeply-grooved drum on the windlass with sprockets which engage the links of the anchor chain
B.winch that is running out of control due to a failure of the overspeed trips
C.line that has jumped off the gypsyhead while under strain
D.nylon line that parts under strain and whips back in a hazardous manner

单项选择题A single fitting installed in a pipeline that either blanks off the pipe or allows a full flow passage of a liquid through the pipe is referred to as a（）.

A.blind flange
B.pivot coupling
C.quick-release coupling
D.spectacle flange

单项选择题A set of interior steps on a ship leading up to a deck from below is known as（）.

A.a companion way
B.tween-decks
C.stairs
D.Any of the above are acceptable

单项选择题A measurement device for inspecting anchor chain is the（）.

A.slide rule
B.go-no-go gauge
C.derrick tape
D.amp probe

单项选择题A design modification of an anchor chain which prevents kinking is the（）.

A.detachable link
B.stud link
C.Kenter link
D.connecting link