单项选择题

0n a vessel, the keel is the primary strength member of the lower hull form in which direction?（）.

A.transverse
B.disagonal
C.longitudinal
D.vertical

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单项选择题

0n the fully containerized ship, approximately one-third or more of the cargo is on deck above the rolling center. Top stowed containers are subject to（）.

A.acceleration greater than on conventional vessels
B.acceleration less than on conventional vessels
C.acceleration the same as on conventional vessels
D.no acceleration

单项选择题

0ne function of a hulwark is to（）.

A.help keep the deck dry
B.prevent stress concentrations on the stringer plate
C.protect against twisting forces exerted on the frame of the vessel
D.reinfo ce th eside stringers

单项选择题

0ne of the principal dangers inherent in liquified petroleum gas is（）.

A.as it warms up it becomes heavier than air
B.the way it reacts with sea water
C.the strong odor it produces
D.its low temperature causes frostbite or freezing