问题
单项选择题
（）is used for measuring horizontal and vertical angles.
A.The marine sextant
B.Thechronometer
C.The magnetic compass
D.The gyrocompass
答案
参考答案：A
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（）is used for measuring horizontal and vertical angles.
A.The marine sextant
B.Thechronometer
C.The magnetic compass
D.The gyrocompass
参考答案：A