题干

下列有关物质性质的叙述正确的是(   )

A:纤维素的水解产物能够发生银镜反应,说明纤维素是还原性糖

B:乙炔能使溴水、酸性高锰酸钾溶液褪色,说明乙炔具有漂白性

C:浓硫酸能干燥H2、Cl2、CO等气体,说明浓硫酸具有吸水性

D:SiO2既能溶于NaOH溶液又能溶于HF溶液,说明SiO2是两性氧化物

上一题 下一题 0.0难度 选择题 更新时间:2019-09-17 05:04:47

答案(点此获取答案解析)

C

同类题3

短文改错

下面短文中有10处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加:在缺词处加一个漏字符号(∧),并在其下面写上该加的词。

删除:把多余的词用斜线(﹨)划掉。

修改:在错的词下画一横线,并在该词下面写出修改后的词。

注意:1.每处错误及其修改均仅限一词;

2.只允许修改10处,多者(从第11处起)不计分。


例如:

It was very nice to get your invitation to spent∧weekend with you. Luckily

the

I was completely free then, so I’ll to say “yes”. I’ll arrive in Bristol at around 8:00 p.m.

am

in Friday evening.

On


My old classroom was interesting because three side of the classroom were made from glass. I enjoyed sit close to the windows and looking at the view. On the left-hand side of the class, I could easy see the football field. In the mornings, it was full of students exercising. The view from the back of the classroom is also splendid. Close to the school there was a beautiful park with many trees around them. Farther in the distance, I could not enjoy the view of snowy mountains. On the right side of the class was the road. I was always interested to see the drivers in hurry in the morning. The position of the classroom with its view made me felt like I was dreaming. If I was only a child when I studied in that classroom, I will never forget it.

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