A.Wave length
B.Wave height
C.Wave breadth
D.wave depth
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A.depths in Malacca and Singapore Straits are stable
B.depths in Malacca and Singapore Straits are changeable
C.depths in Malacca and Singapore Straits are invariable
D.depths in Malacca and Singapore Straits are the same all the time
A.totally enclosed
B.glass-reinforced plastic
C.self-righting
D.powered
A.a draft
B.a freeboard
C.an air draft
D.an under-keel clearance
A.supplied with
B.equipped with
C.manned with
D.fitted with
A.stop engines
B.hold course and speed
C.alter course to port
D.sound the danger signal
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Fog is likely to occur when there is little difference between the dew point and the（）.
ECDIS must be able to perform all of the following EXCEPT（）.
According to the relevant regulation, lifeboat should be powered by（）.
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Full details of all lights and fog signals are shown on（）.
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