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单选题
chronometer（）
A
天文钟
B
车钟
C
六分仪
D
舱机
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Chronometer error may be found by ______.A.radio time signalB.applying the prevailing chronometer rate to previous readingsC.comparison with a timepiece of known errorD.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
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