绕湖的一周是22千米，甲、乙二人从湖边某一地点同时出发反向而行，甲以4千米／小时的速度每

While underway and towing an unmanned tank barge you are required to ______.

A.maintain a strict watch on the barge from the towing vessel

B.fly a red flag from the towing vessel

C.open the tops of all empty tanks on the barge

D.take hourly soundings of any loaded tanks on the barge

The catenary ().

A.acts as a reserve length of towing hawser when the tug applies more power，and it dampens the surge effect of the tow

B.gives an approximation of the amount of strain on the towing hawser

C.is the dip in the towing hawser between the tug and the tow

D.All of the above

Which towing method maintains the most control over the tow ().

A.Tandem towing

B.Honolulu towing

C.Tandem tug towing

D.Breasted tug towing

The tug Vegesack was towing a barge engaged in“stone-fishing”in the vicinity of the Beach End buoy in Harwich Channel．Tug and tow were part of a dredging programme．During the dredging contract，the practice was for the dredging craft，Vegesack，to nominate the passing side for vessels．

The barge was difficult to control in tidal and traffic conditions，and the master needed to exercise considerable skill and anticipation，as well as having to liaise closely with VTS and passing vessels．The German master had been issued with a pilotage exemption certificate and had been operating in the channel for nearly two months before the incident．

The ferry Dana Anglia was outbound from Harwich in daylight and GOOD visibility．When she was close to North Shelf buoy，VTS called Vegesack and agreed that Vegesack，who was in the middle of the channel，would move to the north side．This would enable both Dana Anglia and Bencomo，an inbound vessel currently passing No5 buoy，to pass to the south．VTS gave this passing information to the two vessels．

While passing Platters buoy，Bencomo called Vegesack，requesting her to move to the north．Vegesack said she was going to move to the Harwich（or south）side，and instructed Bencomo to pass to the north．VTS then intervened and confirmed with Vegesack that she wanted both vessels to pass to the north．At this time，Dana Anglia was approaching North West Beach buoy and could see Vegesack heading south，in contravention to what she had been asked to do and had agreed.

Vegesack then started turning to the north．Dana Anglia sounded her whistle and put her engines to full astern．Vegesack then passed close down the starboard side of Dana Anglia.

问题：

Vegesack and her tow ________．

A.were laying stones into the channel to make the navigation more safer

B.were fishing in the channel

C.were passing vessels in the channel

D.were dredging in the channel by picking-up stones

The situation was that ________．A.both Dana Anglia and Bencomo were inbound

B.both Dana Anglia and Bencomo were outbound

C.Dana Anglia was outbound，Bencomo，inbound

D.Dana Anglia was inbound，Bencomo，outbound

It is the ________ that has，in accordance with the practice，the right to determine which side to pass for both inbound and outbound vessels．A.Dana Anglia

B.Bencomo

C.VTS

D.Vegesack

The lesson from this accident is that ________．A.clarity of language is everything at sea

B.Dana Anglia should proceed in the middle of the channel

C.Vegesack should be away from any inbound and outbound vessel

D.it is not necessary for VTS to intervene with the communication between vessels in heavy traffic area

A vessel towing a barge astern would show，at the stern ______.

A.only a stern light

B.a towing light above the stern light

C.two towing lights in a vertical line

D.two white lights in a vertical line

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

A.with a short tow astern

B.nearly bow to bow，at a small angle

C.amidships，parallel to the barge

D.nearly stern to stern，at a small angle to the barge

A.No fog signal

B.A prolonged blast at intervals never to exceed more than two minutes

C.A prolonged blast followed by two short blasts at intervals never to exceed more than two minutes

D.A prolonged blast followed by three short blasts at intervals never to exceed more than one minute

A.going ahead

B.dead in the water

C.in a following current

D.backing

A.directly astern and pushing the tow

B.towing on a hawser

C.towing alongside and parallel to the vessel it is towing

D.towing on the hip