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 . a black ball B . a diamond shape C . two cones，apexes together D . one cone，apex upward

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 . 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 . tow strain B . catenary length C . being in step D . Williamson's Tow

A . is easy to connect B . provides an effective catenary and absorbs shock due to its weight C . makes rigging a swivel unnecessary D . prevents the tow from yawing by the drag of the chains in a seaway

A . two balls in a vertical line B . a diamond shape where it can best be seen C . a ball on each end of the tow D . no dayshape

A . three masthead lights in a vertical line instead of either the forward or after masthead light B . two masthead lights in a vertical line instead of either the forward or after masthead lights C . two towing lights in a vertical line at the stern D . a small white light aft of the funnel

A . two towing lights in a vertical line B . a towing light in a vertical line above the sternlight C . two towing lights in addition to the sternlight D . a small white light in lieu of the sternlight

A . Length of the towline B . Height of the towline connection C . Longitudinal position of the towline connection D . Direction of opposing force

A . the towing vessel should slip first B . the vessel towed should slip first C . they should slip simultaneously D . either vessel may slip first

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

A . continue ahead at slow speed B . continue ahead at half speed C . stop your engines D . back down on your engine

A . The Officer in Charge，Marine Inspection B . The Master，or person in charge of the vessel C . The vessel's owner or manager D . The company's port captain or port engineer

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 . 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 . 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 . all information contained on the barge's Certificate of Inspection B . the condition of all towing gear to be used C . all navigational aids to be used D . the barges load line and draft reading

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

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 . forward masthead light B . after masthead light C . stern light D . All of the above

A . the catenary dragging on the bottom B . swamping of the tow C . the tow tending to dive D . yaw

A . not exceed bare steerageway during the transit B . take a strain as soon as you can to control the tow C . come up to speed very slowly and maintain a safe speed D . come up to speed quickly，then cut back power considerably to ease the strai

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