单项选择题
A.900° B.1260° C.1620° D.1800°
A.1’10" B.1’40" C.2’20" D.3’20"
A.60° B.70° C.100° D.120°
A.仰角1°33’30" B.俯角1°33’30" C.仰角1°26’30" D.俯角1°26’30"
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