During the hours of darkness
At all times when underway
From sunset to sunrise and restricted visibility
Sunrise to sunset
第1题：
The street lights will be going on when night falls.()
第2题：
To determine what navigation lights and day-shapes must be displayed on mobile offshore drilling units under tow，you should check the ______.
A.American Bureau of Shipping classification rules
B.International Regulations for Preventing Collisions at Sea
C.Safety of Life at Sea Convention
D.Minerals Management Service rules
第3题：
Navigation lights must be displayed in all weathers from sunset to sunrise. They also _____.
A.must be displayed when day signals are being used
B.must be displayed when moored to a pier
C.may be extingushed at night on open waters when no other vessels are in the area
D.may be displayed during daylight
第4题：
According to the Rules, when should lights be displayed?______.
A.During the hours of darkness
B.At all times when underway
C.From sunset to sunrise and restricted visibility
D.Sunrise to sunset
第5题：
You are entering port and have been instructed to anchor，as your berth is not yet available．You are on a SW'ly heading，preparing to drop anchor，when you observe the range lights as shown on your starboard beam．You should ______．
A.not drop the anchor until the lights are in line
B.ensure your ship will NOT block the channel or obstruct the range while at anchor
C.drop the anchor immediately as the range lights mark an area free of obstructions
D.drop the anchor immediately as a change in the position of the range lights will be an indication of dragging anchor
第6题：
A.A
B.B
C.C
D.D
第7题：
A vessel may exhibit lights other than those prescribed by the Rules as long as the additional lights ______.
A.are not the same color as either side light
B.have a lesser range of visibility than the prescribed lights
C.do not impair the visibility or distinctive character of the prescribed lights
D.All of the above
第8题：
when you are steering on a pair of range lights and find the upper light is in line above the lower light ,you should _____.
A.continue on the present course
B.come right
C.wait until the lights are no longer in a vertical line
D.come left
第9题：
The number or name of a tank barge shall be ______．
A.Displayed in at least 4 different positions on the barge
B.Carved on a wooden board and attached to the barge's hull
C.Displayed as close to the navigation lights as possible
D.Displayed at the highest point of the barge's hull such that it can be seen from either side
第10题：
Of the following sound combinations， only （） is permissible according to the sequential rules in English.
Akibl
Bbkil
Cilkb
Dilbk