單項(xiàng)選擇題

A schooner is a fore-and-aft rigged vessel with（）.

A.a single mast
B.two masts: with the mizzen stepped abaft the rudder post
C.two masts: with the mizzen stepped forward of the rudder post
D.at least two masts: a foremast and a mainmast

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A sail hook is used for（）.

A.hoisting a windsail
B.parceling
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A safety feature provided on all inflatable liferafts is（）.

A.overhead safety straps
B.built in seats
C.internal releasing hooks
D.water stabilizing pockets