For a floating vessel，true mean draft is always the（）.

A . average of the observed drafts B . draft at the centre of flotation C . draft corresponding to the center of buoyancy D . metacentric height

A . When at anchor，the pilot vessel is only required to sound anchor signals B . The identification signal must be sounded any time the pilot vessel is underway C . The pilot vessel may only sound the identity signal when making way D . All of the above

A . be tender B . have a quick and easy motion C . be stiff D . yaw

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 . She will have a large metacentric height B . Her period of roll will be large due to her large metacentric height C . She will have an unusually high center of gravity D . She will pitch heavily

A . The fishing vessel must keep clear of the vessel not under command B . If the vessel not under command is a power-driven vessel，she must keep clear of the fishing vessel C . They must exchange whistle signals D . Both vessels are required to take action to stay clear of each other

A . reflect B . shown C . detected D . defected

A . It has a small GM B . It pitches heavily C . It has an unusually high center of gravity D . Its period of roll is short

A . Fuel vapors gather in the lowest portions of the vessel B . Fuel vapors can only be ignited by an open flame C . Vent outlets should be located above the level of the carburetor air intake D . None of the above

A . be tender B . have a slow and easy motion C . be stiff D . have a tendency to yaw

A . center of gravity B . center of buoyancy C . center of flotation D . metacenter

A . heel until the angle of loll is reached B . list until the center of buoyancy is aligned vertically with the center of gravity C . trim to the side opposite TCG until all moments are equal D . decrease draft at the center of flotatio

A . be tender B . have a slow and easy motion C . be stiff D . have a tendency to yaw

A . compass error B . variation C . magnetic dip D . deviatio

A . only when there is positive stability B . only when there is negative stability C . only when there is neutral stability D . at all time

A . A lightly laden vessel requires as much stopping distance as a fully laden vessel when the current is from astern B . A vessel is dead in the water when the back wash from astern operation reaches the bow C . A tunnel bow thruster can be used in an emergency to reduce the stopping distance D . When a vessel is dead in the water any speed displayed by doppler log reflects the current

A . aboat which the vessel lists and trims B . which coincides with the center of buoyancy C . which, in the absence of external forces, is always vertically aligned with the center of gravity D . which is shown in the hydrostatic tables as VCB

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 . The vessel has negative GM B . The center of gravity is on the centerline C . The list can be corrected by reducing KM D . The vessel has asymmetrical weight distributio

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 . center of buoyancy B . center of flotation C . uncorrected height of the center of gravity of the vessel D . center of gravity of the vessel corrected for free surface effect

A . They are heavier than air and will settle in the lowest part of the vessel B . They are lighter than air and will settle in the highest part of the vessel C . They should be vented into the engine to improve combustion D . They should be vented into the wheelhouse

A . metacenter B . amidships C . center of flotation D . geometric center of the displaced volume

A . The vessel has negative GM B . The center of gravity is on the centerline C . The list can be corrected by reducing KM D . The vessel has asymmetrical weight distributio