问题
单项选择题
（）is the navigational timekeeper of the vessel.
A.The marine sextant
B.The chronometer
C.The magnetic compass
D.The gyrocompass
答案
参考答案：B
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（）is the navigational timekeeper of the vessel.
A.The marine sextant
B.The chronometer
C.The magnetic compass
D.The gyrocompass
参考答案：B