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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单项选择题

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

单项选择题

Structural bulkheads on a ship are usually（）.

A.continuous
B.watertight
C.transverse
D.non-watertight

单项选择题

Signs of racking stresses generally appear at the（）.

A.bow and stern shell frames and plating
B.junction of the frames with the beams and floors
C.garboard strake，at each side of the keel
D.thrust bearing of the main shaft