A.concentrated high and the double bottoms empty
B.concentrated low and the double bottoms empty
C.evenly distributed vertically with the double bottoms full
D.concentrated and with the double bottoms full
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A.Down by the bow
B.Down by the stern
C.Down by either the bow or stern
D.In level trim
A.have a small amplitude of roll in heavy weather
B.tend to ship water on deck in heavy weather
C.be subject to severe racking stresses
D.be less likely to have cargo shift
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Which of the following is not an operation mode of AIS?（）
According to the relevant regulation, lifeboat should be powered by（）.
The helm command PORT TWENTY means（）.
When the wave period and the apparent rolling period are the same（）.
Fog is likely to occur when there is little difference between the dew point and the（）.