On an OSV，when may a work vest be substituted for a required life jacket?A.To replace a damaged life jacketB.For use during fire drillsC.For use during boat drillsD.At no time

How many adult life jackets are required on board a ship ________．

A.Enough for 100 percent of the persons allowed on board

B.One for each work station and industrial work site

C.Enough for 150 percent of the persons allowed on board

D.Both A & B above

Shipping society approved buoyant work vests are considered to be items of safety equipment and may be worn by members of the crew ______．

A.in lieu of life preservers during fire drills

B.in lieu of life preservers during boat drills

C.in lieu of life preservers during an actual emergency

D.when carrying out duties near a weather deck's edge

Which statement is TRUE concerning insulating flanges ________．

A.They should be inspected and tested periodically to ensure that the insulation is clean and in good condition

B.Switching off a cathodic protection system may be substituted for using an insulating flange

C.The measured resistance value after installation should be less than 1，000 ohms

D.After the insulating flange is installed，hot work may be performed on deck

The minimum amount of lifesaving equipment required aboard an 85-foot uninspected towing vessel consists of ______．

A.One approved flotation cushion for each person on board

B.One approved life preserver for each person on board and one life ring

C.One approved inflatable vest for each person on board

D.Lifeboat capacity equal to 1 1/2 times the number of persons on board

Coast Guard approved buoyant work vests ______．

A.may be substituted for 10 percent of the required life preservers

B.should be stowed adjacent to lifeboats and emergency stations

C.may be used by boat crews and line handlers during lifeboat drills

D.should be used when carrying out duties near a weather deck's edge

Which statement is TRUE concerning buoyant work vests aboard tankers ________．

A.They may be worn while working on deck but not while working over the side

B.They must be used only under supervision of a designated ship's officer

C.They will be accepted for up to 10% of the required life preservers

D.They may be worn during drills

For GMDSS，when may a compulsory vessel not be allowed to leave port ________．

A.When the vessel is in an overloaded condition

B.When the vessel has arranged for both duplication of equipment AND shore-based maintenance

C.When the vessel has replaced a required piece of GMDSS-related equipment but its performance has not been verified or logged

D.When the vessel is carrying only two licensed GMDSS Radio Operators and is capable of performing all required functions