A.prevent the passage of flammable gases
B.prevent the passage of poisonous vapors
C.delay the spread of heat and flames
D.maintain watertight integrity
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A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits
A.Globe valve
B.Butterfly valve
C.Gate valve
D.Packless valve
A.swivel
B.cathead spool
C.drawworks
D.stand pipe
A.at each frame
B.amidships
C.one-third the distance from the bow
D.one-third the distance from the stern
A.greater at the bow and stern
B.reduced at the bow and stern
C.uniform over the length of the vessel
D.uniform over the length of the vessel，with the exception of the machinery spaces，where it is reduced due to increased stresses
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The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
The series of valves used to control the return flow in well control operations is called the（）.
The most common type of davit found on merchant vessels today is the（）.
The portable radio apparatus means（）.
Permission is kindly requested（）the ballast water.
All electrical appliances aboard a vessel should be grounded to（）.
The rudders are amidships and both screws are going ahead. What will happen if the starboard screw is stopped?（）
Static electricity may be built up by the（）.
Anchors are prevented from running out when secured by the（）.
An example of a messenger is a（）.