单项选择题
At least（）radar transponder shall be carried on each side of every cargo ship of 500 gross tonnage and upwards.
A.one
B.two
C.three
D.four
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As you hold a piece of manila line vertically in front of you，the strands run from the lower left to the upper right.Which type of line is this（）.
A.Right-hand laid
B.Cable-laid
C.Sennet-laid
D.Water-laid -
单项选择题
An intermediate spring is（）.
A.Fitted in each leg of the towing bridle
B.Generally located between the “fishplate” and the main towing hawser
C.Secured at the “H” bitts
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A spanner is a（）.
A.cross connection line between two main fire lines
B.special wrench for the couplings in a fire hose line
C.tackle rigged to support a fire hose
D.none of the above
