Safety goggles or glasses are NOT normally worn when（）.

单项选择题Safe water buoys may show ONLY（）.

A.flashing red lights
B.flashing green lights
C.white lights
D.yellow lights

单项选择题On cargo and miscellaneous vessels what is NOT a required part of the fireman’s outfit?（）

A.Self-contained breathing apparatus with a lifeline attached
B.Combustible gas indicator
C.Rigid helmet，boots，and gloves
D.Flame safety lamp

单项选择题On a vessel making a voyage more than 48 hours long，regulations require that（）.

A.a lifeboat drill be held within 12 hours prior to departure
B.fire pumps be tested by starting within 12 hours prior to departure
C.the emergency generator and lighting system be tested by starting and operating within 12 hours prior to departure
D.the entire steering gear be tested within 12 hours prior to departure

单项选择题On a small boat，which knot is best suited for attaching a line to the ring of an anchor?（）

A.Clove hitch
B.Figure-eight knot
C.Fisherman's bend
D.Overhand knot

单项选择题On a ship，when may a work vest be substituted for a required life preserver?（）

A.To replace a damaged life preserver
B.For use during fire drills
C.For use during boat drills
D.At no time