a diamond shape
two cones，apexes together
a black ball
one cone，apex upward
第1题：
A towing vessel pushing a barge ahead and rigidly connected in a composite unit shall show the lights of ______．
A.A vessel towing by pushing ahead
B.A power-driven vessel，not towing
C.A barge being pushed ahead
D.Either answer A or answer B
第2题：
apply the relevant Steering and Sailing Rules as a power-driven vessel
apply the relevant Steering and Sailing Rules as a Sailing vessel
apply the relevant Steering and Sailing Rules as a vessel not under command
apply the relevant Steering and Sailing Rules as a vessel engaged in a towing operation
第3题：
A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started?
A.When the towing vessel enters the fog
B.When the drilling rig enters the fog
C.When the towing vessel can no longer be seen from the rig
D.Immediately
第4题：
vessel towing astern
barge pushed ahead
vessel towing astern only when the length of her tow exceeds 200 meters
this signal does not exist in international waters
第5题：
When the towing vessel enters the fog
When the drilling rig enters the fog
When the towing vessel can no longer be seen from the rig
Immediately
第6题：
a vessel towing by pushing ahead
a power-driven vessel，not towing
a barge being pushed ahead
either answer A or answer B
第7题：
underway
making way
dead in the water
a power driven vessel
第8题：
A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit ______.
A.the masthead lights for a towing vessel
B.the lights for a vessel restricted in its ability to maneuver
C.sidelights，stern light and towing light
D.All of the above
第9题：
a non-power driven vessel
a sailing vessel
a power driven vessel
a power driven vessel or a non-power driven vessel
第10题：
the masthead lights for a towing vessel
the lights for a vessel restricted in its ability to maneuver
sidelights，stern light and towing light
All of the above