A.in
B.up
C.above
D.on
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A.by
B.with
C.on
D.in
A.one natutical mile
B.2 kilometers
C.5 cables only
D.one fathom
A.don't
B.won't
C.not
D.must not
A.at
B.in
C.by
D.with
A.in
B.on
C.with
D.by
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When the wave period and the apparent rolling period are the same（）.
The dew point temperature is（）.
What is it called when it is possible to ignite the vapour above the oil?（）
Full details of all lights and fog signals are shown on（）.
The helm command PORT TWENTY means（）.
（）is on the panel of radar.
Bales close to the deckhead should be covered to prevent（）.
Fog is likely to occur when there is little difference between the dew point and the（）.
Shipboard Emergency Drills must be carried out at least（）on board cargo ship.
A tide is called diurnal when（）.