— Archimedes was really a wise man. He could easily ________ the king's problem.
— Yes, so he was. And he was also a great scientist who had a lot of ________.
A:reduce; adventures
B:beat; decisions
C:solve; achievements
在一次课外实践活动中,老师要求同学们利用测角仪和皮尺估测教学楼AB的高度.同学们在教学楼的正前方D处用高为1米的测角仪测的教学楼顶端A的仰角为30°,然后他们向教学楼方向前进30米到达E处,又测得A的仰角为60°,则教学楼高度AB是多少米?(精确到0.1米,参考数据 3 =1.732)