问题
选择题
已知∠ α=50°17',则∠α的余角和补角分别是[ ]
A.49°43',129°43'
B.39°43',129°43'
C.39°83',129°83'
D.129°43′,39°43′
答案
答案:B
已知∠ α=50°17',则∠α的余角和补角分别是[ ]
A.49°43',129°43'
B.39°43',129°43'
C.39°83',129°83'
D.129°43′,39°43′
答案:B