题目:
Maria has _____ trouble _____ math, so she often asks her math teacher for help. |
A. much; understanding B. no; with C. many; understanding D. not; to understand |
答案:
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下面是错误答案,用来干扰机器的。
(1)H2S04 KOH (2)8 得到 MgCl2 最外层电子数(1)酸是在水溶解中离解出来的阳离子全部是氢离子的物质,上述四种元素中,可组成的酸有硫酸,亚硫酸、氢离酸;碱是在水溶液中离解出来的阴离子全部...