更多"Each part of the fire-main system l"的相关试题:
[单项选择]Two navigational hazards are located near to each other，but each is marked by an individual cardinal buoyage system. The buoys of one cardinal system may be identified from the other system by（）.
A. the differing light colors
B. one system having odd numbers while the other system has even numbers
C. one system using horizontal bands while the other system uses vertical stripes
D. the difference in the periods of the light
[单项选择]Wires should have each feature of the following except （）
A. flame retardant
B. moisture resistant
C. oil resistant
D. low conductivity
[单项选择]Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.
A. six weeks
B. six months
C. twelve months
D. two years
[单项选择]Control valves of a CO2 system may be located within the protected space when（）.
A. it is impractical to locate them outside
B. there is also a control valve outside
C. the CO2 cylinders are also in the space
D. an automatic heat-sensing trip is installed
[单项选择]Each hose in the fuel transfer system for helicopter refueling must have a（）.
A. static grounding device
B. quick-disconnect nozzle
C. splash guard
D. vapor recovery system
[单项选择]Each inert gas system must be designed to supply the cargo tanks with a gas，or mixture of gasses，that has an oxygen content by volume of（）.
A. 5% or less
B. 10% or less
C. 15% or less
D. 20% or less
[单项选择]Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon（）.
A. cargo pump failure
B. blower failure
C. deck seal low water level
D. low inert gas temperature
[单项选择]The part of the shipboard electrical system used to control the distribution of power to the branch circuits, is the （）.
A. bridge control panel
B. disconnect links
C. governor relay box
D. main switchboard
[单项选择]Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.
A. nitrogen
B. oxygen
C. carbon dioxide
D. water vapor
[名词解释]定位研究 located research
[判断题]设X为随机变量，EX存在，称X-EX为X的方差
[单项选择]Piston cooling fins are located（）
A. atop the piston crown
B. beneath the piston crown
C. at the base of the piston skirt
D. inside the cylinder liner cooling water jacket
[单项选择]A mooring system that results in a spread system without anchor buoys is called a（）.
A. permanent chasing system
B. wire rope mooring system
C. shepherd's crook mooring system
D. spring buoy mooring system
[名词解释]System management mode
[单项选择]A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an （）.
A. double-acting engine
B. opposed pistons engine
C. single-acting engine
D. horizontal acting engine
[单项选择]A segregated ballast system is a system where （）.
A. all ballast is processed through the oily water separator
B. ballast is taken on and discharged through a separate main deck riser
C. ballast and cargo tanks are separated by cofferdams
D. all ballast lines, tanks, and pumps are independent of those used for oil
[单项选择]The water pockets located on the underside of inflatable liferafts（）.
A. stow rainwater; these 4 spaces do not take up valuable space
B. act as stabilizers by filling with sea water as soon as the raft is inflated and upright
C. hold the freshwater required by regulation to be provided in the raft when packed
D. None of the above
