①仁爱思想
②宽厚美德
③以“我”为中心的思维方式
A:①②
B:②③
C:①③
D:①②③
盖斯定律认为能量总是守恒的:化学反应过程一步完成或分步完成,整个过程的热效应是相同的。已知:①H2O(g)=H2O(l); ΔH=-Q1 kJ/mol②C2H5OH(g)=C2H5OH(l); ΔH=-Q2 kJ/mol③C2H5OH(g)+3O2(g)=2CO2(g)+3H2O(g);ΔH=-Q3 kJ/mol下列判断正确的是( )
____
程
跨
需
顺
判
郊
泞
迈
已知△ABC中,A(7,8),B(3,5),C(4,3),M,N是AB,AC的中点,D是BC的中点,MN与AD交于点F,求DF→.
Flags have existed for over 3,000 years. The earliest flags were wooden or metal poles with a carving. About 2,000 years ago pieces of fabric were added to some poles for decoration. Over the next 500 years the free-flying part of the flag became more important.