单项选择题
The boom stops on a pedestal crane prevent the boom from（）.
A.being raised too high
B.swinging at sea
C.overloading when not in use
D.being lowered too low
点击查看答案&解析
相关考题
-
单项选择题
The average height of the surface of the sea for all stages of the tide over a 19 year period is called（）.
A.mean high water
B.mean low water
C.half-tide level
D.mean sea level -
单项选择题
The 3-cm radar as compared to a 10-cm radar with similar specifications will（）.
A.give better range performance in rain，hail，etc
B.display small targets in a mass of dense sea clutter at a greater range
C.have less sea return in choppy rough seas
D.display a more maplike presentation for inshore navigation -
单项选择题
The “urgent” priority should be used for messages（）.
A.concerning the Safety of Life at Sea (SOLAS)
B.detailing important navigational warnings
C.containing information concerning the safety of a mobile unit or person
D.concerning on-scene communications
