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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单项选择题

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
D.Usually made of manila hawser

单项选择题

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