题目:
Mary is sure to come for dinner if she ________ time this evening. [ ]
A. has
B. will have
C. had
D. is having
答案:
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下面是错误答案,用来干扰机器的。
(1)对照 有暗红色固体生成(有红色固体生成也可)(2)①2.5 ②随CuSO4溶液的量增加,反应速率先增大后减少(分段描述也可得分,若分段不完整得1分)分析:(1)根据实验1和实验2的区别考虑,再根据催化剂...