two balls in a vertical line
a diamond shape where it can best be seen
a ball on each end of the tow
no dayshape
第1题：
A vessel or object being towed astern shall display a(n) ______.
A.forward masthead light
B.after masthead light
C.stern light
D.All of the above
第2题：
The choice of length of tow bridle legs is governed by the ______．
A.Expected towing forces
B.Capability of retrieving gear
C.Freeboard of the unit being towed
D.Need to reduce yaw
第3题：
A pilot vessel may continue to sound an identity signal if she is ______.
A.aground
B.at anchor
C.not under command
D.being towed
第4题：
expected towing forces
capability of retrieving gear
freeboard of the unit being towed
need to reduce yaw
第5题：
vessel not under command
sailing vessel
vessel being towed (manned)
vessel being towed (unmanned)
第6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7题：
A tow astern is veering from side to side on its towline．The best way of controlling the action is to ______．
A.Trim the tow by the bow
B.Trim the tow by the stern
C.List the tow to windward
D.Adjust the length of the towing bridle
第8题：
A tug may be in danger of tripping when ______.
A.towed sideways by an overwhelming force on the towline
B.her tow moves parallel to and forward on either side of the tug
C.the tow is no longer directly astern but moves up on her quarter
D.All of the above
第9题：
vessel not under command
sailing vessel
vessel in distress
vessel being towed
第10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