单项选择题

In order to determine latitude, the navigator must know ______.

A．Greenwich time and local time
B．a good deal of mathematics
C．the angle between Polaris and the horizon
D．his precise location
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单项选择题
A navigator's chronometer will always show
A．Greenwich time
B．noon time
C．local time
D．sun time
单项选择题
In order to establish the fix or precise location of a ship, the navigator must know ______.
A．his latitude
B．his longitude
C．local time
D．both his latitude and longitude
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