單項選擇題On a ship,a door that is required to be marked KEEP CLOSED is designed to().

A.prevent the passage of flammable gases
B.prevent the passage of poisonous vapors
C.delay the spread of heat and flames
D.maintain watertight integrity


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題Limit switches are used on which davits?()

A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits

4.單項選擇題In ship construction,keel scantlings should be the greatest().

A.at each frame
B.amidships
C.one-third the distance from the bow
D.one-third the distance from the stern

5.單項選擇題In ship construction,frame spacing is().

A.greater at the bow and stern
B.reduced at the bow and stern
C.uniform over the length of the vessel
D.uniform over the length of the vessel,with the exception of the machinery spaces,where it is reduced due to increased stresses