考研 2022_02_20 每日一练
According to the surveys in the U. S., _____.
[A] bullying among adults is also rising [B] parents are not supervising their children well
[C] parents seldom believe bullies [D] most parents resort to calling to deal with bullying
用0.1000 mol·L-1NaOH标准溶液滴定0.10 mol·L-1HCI和0.10 mol·L-1H3P04混合溶液时,可能有(8) 个滴定突跃。已知:H3P04的Kθa1 =7.5×10-3,Kθa2=6.2×10-8,Kθa3=2.2×10-13。