In towing，heaving lines are used for（）.

A . be fitted with a positive fuel shut-off valve located at the tank B . have a shut-off valve at the top of the tank C . have a gate valve easily accessible in the space where the tank is located D . have a drain cock at the lowest point in the fuel line

A . A based opt-in model uses virtualized identifiers B . A based opt-in model uses hardware values as identifiers C . A logical server opt-in model uses virtualized identifiers D . A logical server opt-in model uses hardware values as identifier

A . cast B . to cast of C . cast off D . to cast off

A . towing vessel is less than 50 meters B . towing vessel is greater than 50 meters C . tow is less than 200 meters D . tow is greater than 200 meter

A . change course B . slow down C . heave to D . adjust tow line length

A . give access to B . links up with C . have contact with D . is constructed of

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

A . use lye or other mild detergent B . wash it with fresh water，dry and store it C . wash it with salt water D . use cleaning fluid on nylon，dacron and other synthetic line

A . brought to a position with the stern into the seas B . allowed to take its own head C . brought to lay in the trough D . brought bow into the sea

A . Chain B . Ring C . Solid thimble D . A fishplate

A . made only of wire rope，due to possible weather conditions B . that will have the tow on a crest while your vessel is in a trough C . that will have the tow on a crest while your vessel is on a crest D . with little dip to gain maximum control of the tow

A . pushed ahead B . towed alongside C . towed astern D . Any of the above

A . 正确 B . 错误

A . synchronism B . harmony C . check D . ste

A . the masthead lights for a towing vessel B . the lights for a vessel restricted in her ability to maneuver C . sidelights，stern light，and towing light D . All of the above

A . captain B . capstan C . capital D . carpenter

A . flex joint B . slip joint C . heave joint D . riser joint

A . no fog signal B . one short blast C . one prolonged and three short blasts D . one prolonged，one short，and one prolonged blast

A . protect the towline from chafing B . secure the end of the towline on the tug C . stop off the towline while retrieving it D . absorb shock loading on the towline

A . The towing line between the two vessels should be clear of the water B . The towing line should be taut at all times between the vessels C . There should be a catenary so the line dips into the water D . None of the above

A . it increases the likelihood of collision between the towing vessel and the disabled vessel B . recreational boaters tend to make the heaving line fast to the towed vessel as if it were the towline C . the monkey fist may injure someone D . it may reduce the catenary and increase yawing

A . inherent weakness B . tendency to rot if left damp C . danger to crew if it parts D . strength and shock absorbing abilitie

A．A.“the Lamb” B．B.“The Tyger” C．C.“The Cheminey Sweeper” D．D.“The Sick Roes”

A.pushed ahead B.towed alongside C.towed astern D.Any of the above