如图，AF是△ABC的高，AD是△ABC的角平分线，且∠B＝36°，∠C＝76°，求∠DAF的度数。
楚天汽车销售公司5月份销售某种型号汽车，当月该型号汽车的进价为30万元/辆，若当月销售量超过5辆时，每多售出1辆，所有售出的汽车进价均降低0.1
在5KCl+KClO3+3H2SO43Cl2↑+3K2SO4+3H2O中，被氧化的氯元素与被还原的氯元素的质量比为 （ ） A．5:1 B．1:5 C．1:1
3．依次填入下面文段空白处的语句，衔接最恰当的一组是（ ） 孔子创立了历史褒贬应“见之于行事”的撰述原则。 。
执行如图所示的程序框图，输出的T＝ ( ) A. 12 B. 15 C.20 D.30
----- Mary looks very upset. She _______ failed to pass the exam. ----- I guess so. It's very difficult after all. A must have B could have C should have D might have
She was such a proud person that she would die ____ she would admit she was wrong. A. rather than B. until C. after D. before
如图，阳光下斜坡旁有一棵树，它的阴影投在斜坡上为米，斜坡与平面形成的坡角，光线与斜坡形成的．求树的高度．（精确到米）参考数据：，，，
