A.the galvanizing on steel
B.a hatch cover
C.the outer plating of a vessel
D.synonymous with decking
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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
A.degaussed
B.demagnetized
C.soaked
D.sandblasted
A.wooden plug
B.soft rubber plug
C.two-piece soft patch
D.mechanical means of closing
A.drop strakes
B.stealers
C.throughs
D.voids
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
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Grinding to eliminate shallow surface defects should be done（）.
Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
Buckler plates are（）.
The perforated，elevated bottom of the chain locker，which prevents the chains from touching the main locker bottom and allows seepage water to flow to the drains，is called a（）.
Prior to magnetic particle inspection of anchor chain，the chain should be（）.
Freeboard is measured from the upper edge of the（）.
In vessel construction，a greater number of watertight bulkheads results in（）.
Shell plating is（）.
The riding pawl is（）.
The antennas of the trucks on deck are not fitted（）.