（a3）2+a2•a4等于（ ） A．2a9 B．2a6 C．a6+a8 D．a 发布时间：2017-04-27 21:03 │ 来源：www.tikuol.com 题型：选择题 问题： （a3）2+a2•a4等于（ ）A．2a9B．2a6C．a6+a8D．a12
题型：选择题 给下列问句选出合适的答语。( ) 1. Where did you go yesterday? ( ) 2. What do you do on Sunday? ( ) 3. Mum, did you miss me? ( ) 4. What happened？ ( ) 5. How did you go to school yesterday?A. Yes, I did. B. I broke my arm. C. I do my homework. D. I went to the zoo. E. I went to school by bus. 查看答案
题型：选择题 有5.1 g镁铝合金，投入500 mL、2 mol·L-1的稀盐酸溶液中，金属全部溶解后，再加入4 mol·L-1 NaOH溶液，若要求达到沉淀最大值，则加入NaOH 溶液应为 [ ]A.250 mL B.425 mL C.500 mL D.560 mL 查看答案