A vessel is underway with a work stage rigged over the side. A seaman may work on the stage，but only when（）.

A . The Master of the vessel must be on the bridge when the radar is in use B . The radar equipment is only required to be used in restricted visibility C . The use of a radar excuses a vessel from the need of a look-out D . This equipment must be used to obtain early warning of risk of collisio

A . American Consul B . Classification Society C . Captain of the Port D . Officer in Charge，Marine Inspectio

A . a single mast B . two masts: with the mizzen stepped abaft the rudder post C . two masts: with the mizzen stepped forward of the rudder post D . at least two masts: a foremast and a mainmast

A . by sight and hearing only B . by all available means besides sight and hearing C . by all available means except sight and hearing D . by none of above mea

A . A flashing yellow light B . A red light visible all around the horizon C . A green light visible all around the horizon D . An illuminated red and yellow caution flag

A . pallet B . barrel hook C . spreader D . snotter

A . turning maneuver B . course setting C . position fixing D . regulating speed

A . Whether she is normally a fishing or a trawling vessel B . Her gross tonnage C . Her length D . The type of gear she carrie

A . not under command B . being towed C . on pilotage duty D . aground

A . having engaged in fishing B . engaging in fishing C . engaged in fish D . engaged in fishing

A . The aluminum will provide greater resistance to the spread of fire by conduction B . The aluminum structure is usually attached to a steel coaming by a method that insulates the two metals C . If the superstructure is stressed，an aluminum structure requires additional expansion joints to prevent fracture D . The steel at the area of the aluminum-to-steel connection must be closely checked for galvanic corrosio

A . vessel not under command B . sailing vessel C . vessel being towed (manned) D . vessel being towed (unmanned)

A . ahead of the storm center B . in the dangerous semicircle C . in the navigable semicircle D . directly in the approach path of the storm

A . When dead in the water，it is often difficult to find the neutral position and slight headway or sternway may result B . When going directly from full ahead to full astern，there is complete steering control C . When the vessel has headway and the propeller is in neutral，there is no effect on rudder control D . When maneuvering in port，full ahead or astern power can usually be obtained without changing shaft RPM

A . information of such condition from yourself B . notification of such condition from yourself and the Second Officer C . notification of such condition from yourself and any other member of the crew D . notification of such condition from yourself or the Second Officer

A . a vessel restricted in her ability to maneuver B . a vessel under command C . a passenger ship D . a seaplane on the water

A . about one-quarter of the vessel's length from the stern B . at the bow C . about one-third of the vessel's length from the bow D . aft of the propeller

A . Passengers are excluded from the pilothouse while underway B . Passengers are permitted in the pilothouse during daylight hours only C . Passengers are permitted to visit the pilothouse when authorized by the Master and officer of the watch D . Passengers are permitted in the pilothouse when they are escorted by a ship's officer

A . radar scanning B . radar plotting C . compass bearings D . All of the above

A.Start the exhaust blowers B.Start the intake blowers C.Not ventilate the cargo holds D.Ventilate the cargo holds

A.Quickly to port，then more slowly to port B.Probably to port C.Slowly to port，then quickly to starboard D.Probably to starboard