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 holding capability of an anchor is primarily determined by the（）.
In ship construction，frame spacing is（）.
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（）.
Each cylinder in a two stroke cycle engine experiences combustion（）.
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（）.
On a ship，a door that is required to be marked KEEP CLOSED is designed to（）.
The purpose of a bilge well is to（）.
In ship operations，hoisting and lowering pipe in and out of the drilled hole is the main function of the（）.
As oil pipe line connections were broken，（）quantity of oil was caused to spill onto the wharf and into the dock water.