The test of a towing vessel’s steering gear control system includes each item EXCEPT（）.

A . There shall be at least 3 ventilator ducts open to the atmosphere B . At least one exhaust duct shall extend from the open atmosphere to the lower portion of the bilge C . At least one intake duct shall extend from the open atmosphere to the lower portion of the bilge D . Only vessels using fuel with a flash point above 110°F need ventilate engine and fuel compartment

A . Make periodic inspections of bilges B . Keep the barge under constant surveillance C . Have a properly certificated tankerman or at least one licensed officer on board the towing vessel D . Verify ullage reading

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 . chain B . wire C . nylon D . manila

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

A . reduce the draft of the barge B . shorten one leg of the bridle C . place bulky deck loads as far aft as possible D . trim the barge down by the bow

A . Phone+Desktop B . Desktop C . Switch D . Router E . Trunk

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

A . Reduce unnecessary disruption， delay，rework， and other problems by establishing test cases for use in verifying that the systems meets operational， functional， and interface requirements B . Improve its ability to make sound financial decisions by developing a business case based on its business requirements and establishing a basis for developing a technology strategy C . Reduce operating costs and limit charge-related incidents by providing a consistent and efficient set of processes D . Improve the return on investment and hasten migration by identifying and planning for necessary infrastructure changes and resource additions， as well as reduce deployment costs by analyzing gaps in early in the planning process to determine whet is needed to support the system

A . yaw B . surge C . sway D . swing

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 . synchronism B . harmony C . check D . ste

A . port and starboard strings B . outer strings C . drag strings D . side string

A . one-half the SWL of the main towing hawser B . three-fourths the SWL of the main towing hawser C . that of the main towing hawser D . twice that of the main towing hawser

A . The further forward and closer to amidships the more readily the tug will trip B . Placement further aft permits more effective pulling，better steering and eliminates the danger of tripping C . Installing the bitts down low lowers the center of gravity D . The height and position of towing bitts has no significance

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 . eddies under the bar B . swift current under the bar causing loss of control C . cross-currents pushing the tow away from the bar D . cross-currents pushing the tow into the bar

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 . main string B . push string C . power string D . face string

A.a oxygen-free environment B.an environment with the same concentration of oxygen as the Earth has C.a carbon dioxide-free environment D.an environment filled with the greenhouse gas