A.the chocks at the bow of a towed vessel
B.the most forward，centermost point of a towed vessel such as a sturdy bow rail
C.the mast of a towed sailboat
D.a secure fitting near the bow of the towed vessel
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A.a Coast Guard inspector
B.a registered professional engineer
C.the owner or Master of the vessel
D.a licensed electrician
A.shown below the stern light
B.white in color
C.displayed at the masthead
D.a yellow light having the same characteristics as the stern light
A.shown at the bow
B.white in color
C.shown in addition to the stern light
D.an all-round light
A.tug's engineroom or the bow
B.pilot house or aft steering station
C.forecastle
D.towing bitts by reaching over and releasing a lever
A.on course
B.headed fair
C.holding on
D.in shape
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A tow of 9 barges is made up three abreast by three long. The towboat is faced up to the last barge of the center string. The outer two strings of barges are the（）.
A time diagram is a diagram of the celestial sphere as observed from above the（）.
A spanner is a （）.
A special daymark is a（）.
A stand-on vessel is（）.
A tug is “in irons” when held in a fixed position by（）
A tsunami is caused by a(n)（）.
A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when（）.
A towing vessel’s fire detection system may be certified to comply with the Coast Guard’s towing vessel fire protection regulations by（）.
A towing light is（）.