A.any deck below the main deck and above the lowest deck
B.a member that gives fore-and-strength
C.made by placing two bulkhead a few feet apart
D.a heavy fore-and-aft beam under the deck
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A.vapor to oxygen
B.the flammable limit concentration
C.the autoignition concentration
D.the lower explosive limit concentretion
A.dense bulk cargoes
B.household appliances
C.fragile cargoes
D.heavy industrial machinery
A.negative GM
B.propressive flooding
C.structural failure
D.an immediate need to ballast
A.structural bulkhead
B.exterior bulkhead
C.certerline bulkhead
D.joiner bulkhead
A.cutting a square notch at each end of the crack
B.drilling a hole at each end of crack
C.slot-welding the crack
D.welding a doubler over the crack
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It is dangerous for vessels without the operational radar（）the estuary.
According to the relevant regulation, lifeboat should be powered by（）.
Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
The mean draft of a ship is the draft（）.
When steering by autopilot,how often should the steering be checked?（）
The ISM code is part of（）.
In the Northern hemisphere northerly winds may cause temperature（）.
Bales close to the deckhead should be covered to prevent（）.
（）is on the panel of radar.
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.