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
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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
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
最新試題
If a gasoline engine turns over freely but will not start，the cause is generally（）.
The portable radio apparatus means（）.
An example of a modern anchor which has a stock is a(n)（）.
The function of the bypass valve on the self-contained breathing apparatus is to（）.
Anchors are prevented from running out when secured by the（）.
The holding capability of an anchor is primarily determined by the（）.
Limit switches are used on which davits?（）
If the engine of a survival craft does not start，check to see（）.
Permission is kindly requested（）the ballast water.
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（）.