搜题请搜索小程序“爱下问搜题”
问题 单项选择题

城市空间布局也是城市景观形成的一个重要层面，城市规划不仅要创造良好的生产生活环境，考虑城市空间组织功能的要求，而且应具有优美的形态结构，其具体要求是()。①城市总体布局艺术 ②城市空间布局要充分体现城市美学③城市空间景观组织 ④城市轴线艺术⑤继承历史传统、突出地方特色

A．①②③④⑤

B．①②③⑤

C．①③④⑤

D．①②③④

答案

参考答案：A

解析：城市用地布局的艺术要求包括①②③④⑤的内容。

单项选择题

It is quite reasonable to blame traffic jams, the cost of" gas and the great speed of modern life, but manners on the toad are becoming horrible. Eye,body knows that the nicest men would become fierce tigers behind the wheel. It is all right to have a tiger in a cage, but to have one in the driver’s seat is another matter.
Road politeness is not only good manners, but good sense too. It takes the most cool-headed drivers great patience to give up the desire to beat back when forced to face rude driving. On the other hand, a little politeness goes a long way towards reducing the possibility of quarrelling and fighting. A friendly nod or a wave of thanks in answer to an act of politeness helps to create an atmosphere of good will and calmness so necessary in modern traffic conditions. But such behaviors of politeness are by no means enough. Many drivers nowadays don’t even seem able to recognize politeness when they see it.
However, misplaced politeness can also be dangerous. Typical examples are the driver who waves a child crossing the street at a wrong place into the path of oncoming cars that may be not able to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they want to.
An experienced driver, whose manners are faultless, told me it would help if drivers learnt to correctly join in traffic stream without causing total blockages that give rise to unpleasant feelings. Unfortunately, modern drivers can’t even learn to drive,let alone master the roadmanship. Years ago, experts warned us that the fast increase of the car ownership would demand more give-and-take from all road users. It is high time for all of us to take this message to heart.

The passage mainly talks about______.

A. road politeness


B. traffic jams
C. good manners


D. modern drivers
查看答案
填空题

Mn、Fe均为第四周期过渡元素，两元素的部分电离能数据列于下表：

元素MnFe
电离能

/kJ·mol－1

I1717759
I21 5091 561
I33 2482 957
 

回答下列问题：

（1）Mn元素基态原子的价电子排布式为________，比较两元素的I2、I3可知，气态Mn2＋再失去一个电子比气态Fe2＋再失去一个电子难。对此，你的解释是____________________________________________________________。

（2）Fe原子或离子外围有较多能量相近的空轨道而能与一些分子或离子形成配合物。与Fe原子或离子形成配合物的分子或离子应具备的结构特征是________；②六氰合亚铁离子[Fe（CN）64－]中的配体CN－中C原子的杂化轨道类型是________，写出一种与CN－互为等电子体的单质分子的结构式________。

（3）三氯化铁常温下为固体，熔点282 ℃，沸点315 ℃，在300 ℃以上易升华。据此判断三氯化铁晶体为________。

（4）金属铁的晶体在不同温度下有两种堆积方式，晶胞分别如下图所示。面心立方晶胞和体心立方晶胞中实际含有的Fe原子个数之比为________。
查看答案