A.boss
B.knuckle
C.skeg
D.strut
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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
A.Crescent
B.Sheath-screw boom
C.Quadrantal
D.Radial
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The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
In ship construction，keel scantlings should be the greatest（）.
Static electricity may be built up by the（）.
The C02 flooding system is actuated by a sequence of steps which are（）.
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.
An example of a messenger is a（）.
The purpose of a bilge well is to（）.
The most common type of davit found on merchant vessels today is the（）.
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（）.
Each cylinder in a two stroke cycle engine experiences combustion（）.