A:
B:
C:
D:
如图所示是某种物质熔化时温度随时间变化的曲线图,分析正确的是( )
如图,D为BC的中点,DF⊥AB于F点,DE⊥AC于E点,且DE=DF,则Rt△ ____≌Rt△ ____,根据: ____;Rt△ ____≌Rt△ ____,根据: ____;还有△ ____≌△ ____,且△ABD为 ____三角形,△ABC为 ____三角形.
Sue was so _______ her holiday that she couldn't stop talking about it.
下列朝代中,曾出兵夺取幽云十六州地区,并同辽两次作战的是( )