A:argue with
B:deal with
C:quarrel with
D:come up with
①氧化剂是H3AsO3
②还原性:Cl﹣>As
③每生成1mol As,反应中转移电子的物质的量为3mol
④M为OH﹣⑤SnCl62﹣是氧化产物.
Our geography teacher told us to _____ more information about our city and share it next week.
空间四边形ABCD的对角线AC=8,BD=6,M,N分别为AB,CD的中点,并且AC与BD所成的角为90°,则MN=( )