A.control the pressure of the oxygen as it enters the body
B.allow the wearer to manually give himself oxygen
C.release excess heat which would otherwise cause the bottle to explode
D.allow exhaled gases to pass outside the bottle
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A.boss
B.knuckle
C.skeg
D.strut
A.bilge water may enter the exhaust pipe
B.entry of air may cause vapor lock
C.carbon monoxide may enter the interior of the vessel
D.the joint gaskets may be blown
A.string
B.stand
C.joint
D.standpipe
A.break glass，pull valve，break glass，pull cylinder control
B.sound evacuation alarm，pull handle
C.open bypass valve，break glass，pull handle
D.open stop valve，open control valve，trip alarm
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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The bypass valve on a self-contained breathing device should be opened if（）.
Limit switches are used on which davits?（）
Cargo pump relief valves are piped to the（）.
In the piping systems of a vessel，what type of valve gives the least resistance to fluid flow when fully open?（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
Static electricity may be built up by the（）.
Permission is kindly requested（）the ballast water.
The rudders are amidships and both screws are going ahead. What will happen if the starboard screw is stopped?（）
In nautical terminology a dog is a（）.
An LWT anchor often has difficulty tripping in（）.