A.the change in difference between the forward and aft drafts
B.the sum of free communication, free surface and pocketing
C.the moment of inertia of the ship's waterline plane about the athwartship axis
D.rolling and listing
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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
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
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Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
（）is where the crew eat their meals.
Before any loading takes place any signs of the previous cargo should do（）.
Which of the following shall not the officers in charge of the navigational watch do?（）
Full details of all lights and fog signals are shown on（）.
The loading of the ship must be done in accordance with（）.
When the wave period and the apparent rolling period are the same（）.
（）is halfway between the forward and after perpendiculars and is reference point for vessel construction.
Which of the following is not a form of precipitation?（）