单选题A semisubmersible rig under tow should be ballasted down if（）.A motion begins to be excessiveB water begins to break over the pontoonsC period of roll exceeds 12 secondsD forward progress is halted by head wind

If a man falls overboard from a rig under tow，you should FIRST ______.

A.notify the tug

B.deploy life bouys

C.launch a boat

D.sound the general alarm

You intend to tow a barge with one tug and expect continuous high winds from the north．To reduce the yaw of your tow，you should ______．

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 mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started?

A.When the towing vessel enters the fog

B.When the drilling rig enters the fog

C.When the towing vessel can no longer be seen from the rig

D.Immediately

Apparent wind speed blowing across a vessel under tow can be measured by a(n)______．

A.barometer

B.wind vane

C.anemometer

D.Thermometer

To determine what navigation lights and day-shapes must be displayed on mobile offshore drilling units under tow，you should check the ______.

A.American Bureau of Shipping classification rules

B.International Regulations for Preventing Collisions at Sea

C.Safety of Life at Sea Convention

D.Minerals Management Service rules

When a winch breaks down，or some similar occurrence makes only one winch available at a hatch，which alternate rig would provide a temporary solution while repairs are made ________．

A.Frisco Rig

B.Split fall rig

C.West Coast Rig

D.Yard and stay jury rig

A semisubmersible rig under tow should be ballasted down if ______.

A.motion begins to be excessive

B.water begins to break over the pontoons

C.period of roll exceeds 12 seconds

D.forward progress is halted by head wind