单项选择题
The flood stream here is at an average rate of 0.8（）.
A.cables
B.miles
C.kilometers
D.knot
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The construction portfolio may be included as part of the ship（）.
A.general plans
B.operating manual
C.builders documentation
D.CCS file -
单项选择题
The circular steel structure installed around the propeller of a towboat is the（）.
A.nozzle
B.shroud
C.strut
D.hood -
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The bow thruster generally is ineffective at（）.
A.over 3 knots headway
B.at any speed astern
C.at any speed ahead
D.over 1 knot sternway
