有两瓶无色液体,只知道它们是水和98%浓酒精,但标签失落,甲、乙两位同学为了鉴别

题型:问答题

问题:

有两瓶无色液体,只知道它们是水和98%浓酒精,但标签失落,甲、乙两位同学为了鉴别这两种无色液体展开了如下讨论:甲说:只有利用物理性质才能鉴别;乙说:只有利用化学性质才能鉴别.你对这两位同学的说法有什么评价?你的鉴别方法有哪些?(至少说两点)

考点:化学实验方案设计和实验现象的分析
题型:问答题

根据短文内容及首字母提示填写单词,使短文完整、连贯。

     Anne Jennings is a 17-year-old girl with Down's syndrome (唐氏综合症,一种比较严重的智障).

She has always had a h   1      time at high school. Though she took the same l   2       with her friends

during the early grades, in recent years she has been placed in special education classes.

     She always wished that she wasn't d      3      from her close friends. She would ask, "Why did God

m     4      me have Down's syndrome?" Anne's mother never had a good a     5     to this question.

However, in the e     6      , the teenager discovered that there was n     7      wrong with being exactly

who she is. O     8      October 3rd, she was surprised and h    9       to be elected homecoming queen (被选为返校节女王) of her class.

     "I was always complaining before," she said. "When I became the queen, things c    10     It's

amazing. Everyone loves me. I love myself."

题型:问答题

物业的质量问题中,业主在物业交接后才发现物业质量问题,但原来的法律关系在物业管理阶段仍然存在,业主应当依据有关法律法规追究()的质量责任。

A.管理单位

B.物业服务企业

C.建设单位

D.监理单位

题型:问答题

计算机系统由( )组成。

A.主机和显示器

B.微处理器和软件

C.硬件系统和应用软件

D.硬件系统和软件系统

题型:问答题

()、()是参与式农业机械化技术推广的核心。

题型:问答题

日常教学训练中,教师应如何调动学生学习的积极性?请用简单的案例加以说明。

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