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
最新試題
The portable radio apparatus means（）.
The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.
All electrical appliances aboard a vessel should be grounded to（）.
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（）.
Permission is kindly requested（）the ballast water.
The most common type of davit found on merchant vessels today is the（）.
In relation to cargo gear，what does SWL mean?（）.
If a gasoline engine turns over freely but will not start，the cause is generally（）.
In nautical terminology a dog is a（）.