问题
选择题
已知∠α=53°17′，则∠α的余角等于（ ）
A．127°17′
B．36°43′
C．126°43′
D．37°17′
答案
∵∠α=53°17′，
∴∠α的余角=90°-∠α=90°-53°17′=36°43′．
故选B．
搜题请搜索小程序“爱下问搜题”
已知∠α=53°17′，则∠α的余角等于（ ）
A．127°17′
B．36°43′
C．126°43′
D．37°17′
∵∠α=53°17′，
∴∠α的余角=90°-∠α=90°-53°17′=36°43′．
故选B．
| 选用方框中所给单词的适当形式填空。 | |
1. We _________ ourselves quite a lot at the party. 2. The ________clothes haven't been washed yet. 3. Guangzhou _______in the south of China. 4. John got _________ to Mary. 5. There is no _________ of oil paintings here. 6. Lots of western people are interested in_____culture. 7. __________, everyone can have a great life. |