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
第1题
A.horizontal parallax decreases
B.observer's height above sea level increases
C.humidity of the atmosphere decreases
D.altitude of the body decreases
第2题
A.adjust the barometer
B.indicate any change in the reading of the barometer
C.provide a correction for height above sea level
D.provide a correction for temperature changes
第3题
A.mean sea level
B.mean high water
C.mean low water
D.half-tide level
第4题
A.fishing kit
B.searchlight
C.sea anchor
D.radar reflector
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