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Chronometer error may be found by ______.
A.radio time signal
B.applying the prevailing chronometer rate to previous readings
C.comparison with a timepiece of known error
D.All of the above
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单选题Chronometer error may be found by（）.A
radio time signalB
comparison with a timepiece of known errorC
applying the prevailing chronometer rate to previous readingsD
All of the above
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