更多"Ocean currents are well defined and"的相关试题:
[单项选择]One of the causes of ocean currents is density differences in the water. This is true because （）.
A. in an area of high density the water's surface is lower than in an area of low density
B. surface water flows from an area of high density to one of low density
C. the lesser the density gradient the freer the water is to move
D. it is the density differences that cause the currents to stay in the troughs
[单项选择]River currents tend to（）.
A. pick up speed where the channel widens
B. run slower in the center of the channel
C. hug the inside of a bend
D. cause the greatest depth of water to be along the outside of a bend
[单项选择]The currents are（）mosoonal origin．
A. from
B. on
C. in
D. of
[单项选择]Where would you obtain data on currents for areas of the world not covered by the National Ocean Service（）.
A. In the Coast Pilot
B. In the Nautical Almanac
C. In the List of Lights
D. In the Sailing Directions
[单项选择]Currents are（）in rate and direction.
A. vary
B. variable
C. variably
D. variability
[单项选择]A condition where two currents meet at the downstream end of a middle bar can be determined by a（）.
A. small whirlpool
B. smooth patch of water
C. V-shaped ripple with the point of the V pointing downstream
D. V-shaped ripple with the point of the V pointing upstream
[单项选择]In a river subject to tidal currents，the best time to dock a ship without the assistance of tugs is（）.
A. at high water
B. when there is a following current
C. at slack water
D. at flood
[判断题]Linguistics is generally defined as the scientific study of language.
[单项选择]As defined in the regulations governing marine casualties a “marine employer” may be the（）.
A. owner
B. agent
C. Master
D. All of the above
[单项选择]Altocumulus clouds are defined as（）.
A. high clouds
B. middle clouds
C. low clouds
D. vertical development clouds
[单项选择]Power is defined as the （）.
A. rate of doing work
B. amount of force needed to overcome friction
C. amount of work accomplished
D. distance through which an object is moved
[单项选择]All inspected vessels on unrestricted ocean routes must have equipment on board for testing an individual’s（）.
A. blood
B. breath
C. urine
D. All of the above
[单项选择]Which of the following is defined as static information of AIS?（）
A. Navigational status
B. Safety related messages
C. MMSI
D. Route plan
[单项选择]A pump is defined as device that（）
A. produces pressure
B. imparts energy to a fluid to move it from level ‘A’ to level ‘B’
C. creates a vacuum to move a liquid in all installation
D. is to develop a pressure differential
[单项选择]A ground can be defined as an electrical connection between the wiring of a motor and its（）.
A. shunt field
B. circuit breaker
C. metal framework
D. inter-pole
[多项选择]OCEAN信令仪具有以下功能（）
A. A口数据采集与分析
B. Abis口数据采集与分析
C. GB口数据采集与分析
D. QOS测试
E. 实时监视
