单选题Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.Agreat convenienceBfinding true northCmagnetic characteristicsDsimplicity and reliability
单选题
Despite the rising importance and great convenience of the gyrocompass,the magnetic compass still retain its importance because of its（）.
A
great convenience
B
finding true north
C
magnetic characteristics
D
simplicity and reliability
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