Shell plating is（）.

单项选择题Regulations require that access to a cargo pumproom in a tanker carrying grade D liquid cargo，shall be（）.

A.away from galleys，living quarters，or navigation spaces
B.only from areas equipped with power ventilation systems
C.from the open deck
D.isolated from sources of vapor ignition

单项选择题Prior to magnetic particle inspection of anchor chain，the chain should be（）.

A.degaussed
B.demagnetized
C.soaked
D.sandblasted

单项选择题Pollution regulations require that each scupper in an enclosed deck area have a（）.

A.wooden plug
B.soft rubber plug
C.two-piece soft patch
D.mechanical means of closing

单项选择题Owing to the greater girth of a ship amidships than at the ends，certain strakes are dropped as they approach the bow and stern to reduce the amount of plating at the ends. These strakes are called（）.

A.drop strakes
B.stealers
C.throughs
D.voids

单项选择题One function of a bulwark 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.reinforce the side stringers