()may be a warning for an approaching storm.
A.the presence of cirrus clouds
B.the low-hanging stratus clouds
C.the altocumulus clouds
D.the massive cumulus clouds
第1题
A.Vessels are not in step
B.Tow line feels like it is jumping when touched
C.Catenary comes clear of the water
D.Towed vessel goes in irons
第2题
A.Northwesterly
B.Southwesterly
C.Southerly
D.Northerly
第3题
A.No fog signal
B.A prolonged blast at intervals never to exceed more than two minutes
C.A prolonged blast followed by two short blasts at intervals never to exceed more than two minutes
D.A prolonged blast followed by three short blasts at intervals never to exceed more than one minute
第4题
A.barograph
B.aneroid barometer
C.mercurial barometer
D.All of the above
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