单项选择题

A sheave is a（）.

A.grooved wheel in a block
B.line to hold a lifeboat next to the embarkation deck
C.partial load of grain
D.seaman's knife

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单项选择题

A sea anchor is（）.

A.a heavy anchor with an extra long line used to anchor in deep water
B.a cone shaped bag used to slow down the wind drift effect
C.a padeye to which the sea painter is made fast
D.made of wood if it is of an approved type

单项选择题

A person referring to the stern sheets of a lifeboat is speaking of（）.

A.the line attached to the tack of the lugsail
B.the emergency rudder
C.a canvas awning
D.the aftermost seating

单项选择题

（）is used for heaving up and slacking away the anchor and chain.

A.A winch
B.A windlass
C.A deck crane
D.A lifeboat engine