单项选择题

A navigator's chronometer will always show

A．Greenwich time
B．noon time
C．local time
D．sun time
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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
单项选择题
The cause for the heat in the interior of the earth is ______.
A．not determined
B．the great pressure of the earth
C．radioactive elements
D．the heat remaining from the formation of the earth
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