实现人口、资源、环境、经济协调发展的关键是 ( )
A:控制人口数量
B:提高人口素质
C:以经济建设为中心
D:实现科教兴国战略
下列不属于繁殖行为的是( )
“开辟荆榛逐荷夷,十年始克复先基。”描述的郑成功的历史事迹是( )
How would you like if you were watching your favorite TV program and someone came into the room and just shut it off without asking you?
①2FeTiO3+6C+7Cl2 高温_ 2TiCl4+2FeCl3+6CO ②在氩气环境中:2Mg+TiCl4 高温_ Ti+2MgCl2
下列判断不正确的是( )