在0.1mol/L的CH3COOH溶液中存在如下电离平衡:CH3COOHCH3COO-+H+对于该平衡,下列叙述正确的是( )
⑴made____ Look at that robot.
⑵strong____ My brother is hardworking.
⑶finish____ We can do our homework after dinner.
⑷girl____ My father helps him to clean his room.
⑸beautiful____ Li Hua is really clever.
如图所示,四棱锥P﹣ABCD的底面ABCD是边长为1的菱形,∠BCD=60°,E是CD的中点,PA⊥底面ABCD,PA=3.
(Ⅰ)证明:平面PBE⊥平面PAB;
(Ⅱ)求二面角A﹣BE﹣P的大小.
男生和女生存在着很多的差异,男生在掌握知识的基础上稍逊一筹,但在解题的灵活性上略强;女生在作文的描述、词汇运用等方面更有优势,但在立意的新奇与结构的不拘一格上则稍逊一筹。这则材料说明通过男女同学的交往,可以( )
当你在“百度搜索”中输入“甲骨文”、“殷墟”等关键词时,最可能出现的朝代是 ( )