單項(xiàng)選擇題（）is the main center-line structural member，running fore and aft along the bottom of a ship，sometimes referred to as the backbone.

A.Frame
B.Deckbeam
C.Stringer
D.Keel


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1.單項(xiàng)選擇題The primary barrier of a bulk carrier is formed by（）.

A.the single skin side shell and the inner bottom
B.deck strips，hatch covers and coamings
C.the vertically corrugated transverse watertight bulkheads
D.the single skin side shell between topside and hopper tanks，and the cross deck strips，hatch covers and coamings

2.單項(xiàng)選擇題What can cause a lack of oxygen in a chain locker（）．

A.Absorption
B.Osmosis
C.Evaporation
D.Oxidation

3.單項(xiàng)選擇題Which space cannot be deducted from gross tonnage when calculating net tonnage（）.

A.Crew messroom
B.Forepeak ballast tank
C.Master's cabin
D.Chain locker

4.單項(xiàng)選擇題Which arrangement of shell plating is used most in modern shipbuilding（）.

A.Clinker
B.Flush
C.In-and-Out
D.Joggled

5.單項(xiàng)選擇題Which term refers to a transverse curvature of the deck（）.

A.Deadrise
B.Camber
C.Freeboard
D.Flare

6.單項(xiàng)選擇題Why is it necessary to extend ventilators of gasoline powered vessels to the bilges（）.

A.To keep them dry，and thus easier to clean
B.To remove fuel vapors which are heavier than air
C.To provide adequate air to the engines
D.To cool the machinery areas

7.單項(xiàng)選擇題The Vessel’s cargo holds are properly fitted with（）in way of hatches.

A.Floor-ceiling
B.Battens
C.Covers
D.Hard-wood boards

8.單項(xiàng)選擇題The strake on each side of the keel is called a（）.

A.Sheer strake
B.Gatewood strake
C.Insulation strake
D.Garboard strake

9.單項(xiàng)選擇題Which space（s）is（are）deducted from gross tonnage to derive net tonnage（）.

A.Boatswain's stores
B.Companions and booby hatches
C.Passenger spaces
D.All of the above