单项选择题
A.2°0′ B.2°5′ C.2°10′ D.2°15′
A.4005 B.4000 C.4500 D.4050
A.3°45′ B.3°35′ C.3°25′ D.3°15′
A.167 B.165 C.160 D.168
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