单项选择题
The sea anchor shown as item number 14 will NOT（）.
A.check the liferaft's way
B.keep the liferaft end on to the sea
C.reduce the possibility of capsizing or broaching
D.right the raft if it inflates inverted
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A.mean sea level
B.mean high water
C.mean low water
D.half-tide level -
单项选择题
The purpose of the “set” hand on an aneroid barometer is to（）.
A.adjust the barometer
B.indicate any change in the reading of the barometer
C.provide a correction for height above sea level
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单项选择题
The error in the measurement of the altitude of a celestial body，caused by refraction，increases as the（）.
A.horizontal parallax decreases
B.observer's height above sea level increases
C.humidity of the atmosphere decreases
D.altitude of the body decreases
