one black ball
two cones with bases together
a cone，apex downward
two cones，apexes together
第1题：
On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a ______.
A.vessel being towed
B.fishing vessel engaged in trawling
C.vessel at anchor warning you of her location
D.power-driven pilot vessel on station underway
第2题：
A vessel engaged in fishing，and at anchor，shall show ______.
A.an anchor light
B.sidelights and a stern light
C.three lights in a vertical line，the highest and lowest being red，and the middle being white
D.None of the above
第3题：
According to the navigation rules, all of the following are engaged in fishing except a vessel ______.
A.Setting nets
B.Trawling
C.Using a dredging net
D.Trolling
第4题：
A vessel engaged in fishing shall not impede the passage of______following a traffic lane．
(1)．A power-driven vessel
(2)．a sailing vessel
(3)．any vessel
(4)．a vessel of less than 20 metres in length
A.(1)
B.(1) & (2)
C.(3)
D.(4)
第5题：
A vessel is carrying three lights in a vertical line. The highest and lowest of these are red and the middle light is white. Which statement is always TRUE?
A.During the day，she would display three balls in a vertical line
B.If making way，she would show masthead lights at night
C.If at anchor，she need not show anchor lights while displaying identifying lights
D.Her fog signal would consist of a rapid ringing of a bell for five seconds every minute
第6题：
A vessel engaged in ______ shall not impede the passage of any other vessel navigating within a narrow channel or fairway．
A.mine clearance operation
B.towing operation
C.dredging or surveying or underwater operation
D.fishing
第7题：
A vessel is "engaged in fishing" when ______.
A.her gear extends more than 100 meters from the vessel
B.she is using any type of gear，other than lines
C.she is using fishing apparatus which restricts her maneuverability
D.she has any fishing gear on board
第8题：
A power-driven fishing vessel is underway on the high seas and is not engaged in fishing． Which of the following factors determines what lights she will show？
A.Whether she is normally a fishing or a trawling vessel
B.Her gross tonnage
C.Her length
D.The type of gear she carries
第9题：
A vessel sailing shall keep out of the way of all of the following vessels except a vessel ______.
A.not under command
B.engaged on pilotage duty
C.restricted in her ability to maneuver
D.engaged in fishing
第10题：
For the purpose of the Rules, except where otherwise required, the term ______.
A.vessel includes seaplanes
B.seaplane includes non-displacement craft
C.vessel engaged in fishing includes a vessel fishing with trolling lines
D.vessel restricted in her ability to maneuver includes fishing vessels