搜题请搜索小程序“爱下问搜题”
问题 问答题

简述法律的基本特征。

答案

参考答案：(1)法律具有国家意志性；(2)法律具有国家强制性；(3)法律规定人们的权利和义务，具有普遍适用性；(4)法律是建立和维护有利于掌握国家 * * 的阶级的社会关系和社会秩序的重要手段。

阅读理解
阅读下面短文，从短文后面每题所给的四个选项中选择最佳的一项。
         Linda enjoyed listening to the gossip (闲话) at the water fountain (饮水处 ),and then passed it to others.
Sometimes people got a little hurt. Patty decided that Linda should be taught a lesson.
        After the second class, Patty was at the water fountain. As she took a drink, Abel passed by. "What's
up? " he asked her. Patty said, " Nothing much, the usual. Today is sure an interesting day. But it's not good for
Linda. "
        "What do you mean? What happened? " Abel asked. Patty said sadly, "I heard that Linda got below an A
on her history exam. You know her parents want her to get straight As. I think they'll keep her at home for a
whole week to study. "Before he could ask anything else, Patty walked on.
        Abel caught up with Emily. "Did you hear, "he asked, not waiting for her to answer, "Linda failed on a
history exam and her parents will keep her at home for a whole month? " Emily looked at him in surprise, "But
Linda is a straight- A student.This is terrible. Don't tell anybody, and I won't either."
         At lunch, the gossip was flying fast. Tim asked Bob, " Did you hear about poor Linda? She failed in
history, and her parents are going to get her a tutor (家庭教师)."
         By three o'clock, everybody knew it. All day, Linda had a strange feeling. People were looking at her.
She asked Dana what was going on. He said, "I don't know who found out, but we're really sorry. "
         "Sorry about what? " Linda asked. Dana said, "Everybody knows you failed in all your subjects, and
your parents are taking you out of school." Linda stared(盯着) at him, mouth opened. "How did this gossip
start? It's not true! "Linda began to shout. In a moment , most of her friends were around her. They asked if
there was anything they could do. "Look, " she said, "I got an A on my history exam. Who would start a gossip
like this? "Nobody seemed to know, but they did know that it began at the water fountain.
1.Which of the following (下列句子) is true?
[ ]
A.Nobody liked Linda. 　
B.Linda failed in all her subjects. 　
C.Linda failed on her history exam. 　
D.Almost all the students were sorry for Linda.
2.What's the result of the gossip?
[ ]
A.Linda got a little hurt. 　
B.Everybody came to help Linda. 　
C.Linda's parents took her out of school. 　
D.Linda got an A on her history exam.
3.What' s the main (主要的) idea of the story?
[     ]
A.Linda enjoyed listening to and passing gossips. 　
B.patty started a gossip about Linda. 　
C.Linda was taught a lesson about gossip. 　
D.The gossip began at the water fountain.
查看答案
填空题

（12分）硫酸铜是一种重要的化工原料，工业上常用硫酸为原料来制备硫酸铜。

（1）工业上生产硫酸过程中，焙烧硫铁矿时产生的废渣是一种二次资源。

①为了从废渣中磁选获得品位合格的铁精矿，高温下利用CO使弱磁性Fe2O3转化为强磁性Fe3O4。写出该反应的化学方程式         ；实验发现：CO太多或太少都会导致磁铁矿产率降低，原因是           。

②氯化焙烧工艺是将废渣用氯化钙水溶液调和、成球、高温焙烧，废渣中SiO2与CaCl2等在高温下反应放出HCl，HCl与金属氧化物等反应生成氯化物。反应生成的各金属氯化物以气态形式逸出，进而回收有色金属和回返氯化钙溶液。写出氯化焙烧工艺中生成HCl的化学方程式                      。

（2）测定硫酸铜品体中结品水含量的实验步骤为：

步骤1：准确称量一个洁净、干燥的坩埚；

步骤2：将一定量的硫酸铜晶体试样研细后，放入坩埚中称重

步骤3：将盛有试样的坩埚加热，待晶体变成白色粉末时，停止加热；

步骤4：将步骤3中的坩埚放入干燥器，冷却至室温后，称重：

步骤5：                 ；

步骤6：根据实验数据计算硫酸铜晶体试样中结晶水的质量分数。

请完成实验步骤5。   

（3）已知硫酸铜品体受热可以逐步失去结品水，温度升高还町以分解生成铜的氧化物。观取25．0g CuSO4·5H2O品体均匀受热，缓慢升温至1200℃并恒温1小时，实验测得固体残留率（剩余固体的质量／原始固体质量）与温度的关系如下图所示：

在110℃时所得固体的成分为                ；在1200℃并恒温1小时，反应所得气态产物除去水后，物质的量为               。（填字母）

A．0 mol

B．0．1mol

C．0．125mol

D．大于0．125mol
查看答案