中国走可持续发展道路的必然性体现在我国()
A:自然资源种类多,总量大,类型全
B:计划生育成绩显著,人口增速减慢
C:环境污染和生态破坏依然十分严重
D:人地关系日趋和谐,生态环境优美
- Tom, you look tired this morning. What's wrong?
- I was busy and I didn't go to bed _________ 12 o'clock last night
在△ABC中,∠A-∠C=25°,∠B-∠A=10°,则∠B=____°.