A.afford access to the shell through the double bottoms
B.collect water to be pumped out
C.provide access for the pneumercator
D.provide a base line for sounding measurements
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A.the radio apparatus fitted on the portside
B.the radio with a portable equipment
C.the radio equipment which is easily movable
D.the portable radio with some apparatus
A.radial
B.sheath-screw
C.gravity
D.quadrantal
A.shape of the anchor
B.stowage of the anchor on board
C.anchor's ability to dig in
D.size of the vessel and its draft
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
A.boss
B.knuckle
C.skeg
D.strut
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The function of the bypass valve on the self-contained breathing apparatus is to（）.
Permission is kindly requested（）the ballast water.
Cargo pump relief valves are piped to the（）.
In nautical terminology a dog is a（）.
Each cylinder in a two stroke cycle engine experiences combustion（）.
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，frame spacing is（）.
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（）.
The C02 flooding system is actuated by a sequence of steps which are（）.
The portable radio apparatus means（）.