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 portable radio apparatus means（）.
Static electricity may be built up by the（）.
In relation to cargo gear，what does SWL mean?（）.
Limit switches are used on which davits?（）
The purpose of a bilge well is to（）.
The series of valves used to control the return flow in well control operations is called the（）.
As the propeller turns，voids are formed on the trailing and leading edges of the propeller blades causing a loss of propulsive efficiency，pitting of the blades，and vibration. These voids are known as（）.
If the engine of a survival craft does not start，check to see（）.
The boat is stowed on the davit rather than on a cradle with which type of davit?（）
Permission is kindly requested（）the ballast water.