A.you are entering a space containing poisonous vapors
B.you are entering a space containing explosive gases
C.the regulator of the breathing apparatus malfunctions
D.the face piece of the breathing device is too tight
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A.Crescent
B.Sheath-screw boom
C.Quadrantal
D.Radial
A.flow of petroleum through pipes
B.spraying or splashing of petroleum
C.settling of solids or water in petroleum
D.All of the above
A.pump out
B.to pump out
C.pumping out
D.be pumped out
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
A.Sheath-screw davits
B.Gravity davits
C.Radial davits
D.Quadrantal davits
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In ship construction，frame spacing is（）.
Permission is kindly requested（）the ballast water.
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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（）.
The holding capability of an anchor is primarily determined by the（）.
Limit switches are used on which davits?（）
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On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
Static electricity may be built up by the（）.