直角三角形的两直角边分别是6cm,8cm.则其内切圆的半径为______.

题型:填空题

问题:

直角三角形的两直角边分别是6cm,8cm.则其内切圆的半径为______.

考点:三角形的内心、外心、中心、重心
题型:填空题

整治线布置的内容和基本原则是什么?

题型:填空题

关于内分泌腺的描述正确的是()

A.其腺细胞属腺上皮细胞

B.腺细胞多排成囊泡,有排泄管

C.其分泌物可直接输送靶器官

D.包括甲状腺、肾上腺、垂体、胰岛、睾丸、卵巢等

E.与神经系统无关

题型:填空题
怎样简便就怎样算.
4.3+0.98+0.7=5.27-3.9-0.1=
8.44-(5.44+2.8)=4.9+0.1-4.9+0.1=
题型:填空题

阅读理解。

     Green-space facilities are contributing to an important extent to the quality of the urban environment.

Fortunately it is no longer necessary that every lecture or every book about this subject has to start with

the proof of this idea. At present it is generally accepted, although more as a self-evident statement than

on the base of a closely-reasoned scientific proof. The recognition of the importance of green-space in

the urban environment is a first step on the right way; this does not mean, however, that enough details

are known about the functions of greenspaces in towns and about the way in which the inhabitants (居民)

are using these spaces.

     The theoretical separation of living, working, traffic and recreation which for many years has been

used in town-and-country planning, has in my opinion resulted in disproportionate (不成比例的) attention

for forms of recreation far from home, whereas (但是) there was relatively little attention for improvement

of recreative possibilities in the direct neighborhood of the home. We have come to the conclusion that this

is not right, because an important part of the time which we do not pass in sleeping or working, is used for

activities at and around home. So it is obvious that recreation in the open air has to begin at the street door

of the house. The urban environment has to offer as many recreation activities as possible, and the design

of these has to be such that more obligatory(强制性的) activities can also have a recreative aspect.

     The very best standard of living is nothing if it is not possible to take a pleasant walk in the district, if the

children cannot be allowed to play in the streets, because the risks of traffic are too great, if during shopping

you can nowhere find a spot of enjoying for a moment the nice weather, in short, if you only feel yourself

at home after the street door of your house is closed after you.

1. According to the author, the importance of greenspaces in the urban environment ____.

A. is still unknown

B. is being closely studied

C. is usually neglected

D. has been fully recognized

2. The theoretical separation of living, working, traffic and recreation has led to ____.

A. the disproportion of recreation facilities in the neighborhood

B. all of the recreation facilities far from home

C. relatively little attention for recreative possibilities

D. the improvement of recreative possibilities in the neighborhood

3. The author suggests that the recreative possibilities of greenspaces should be provided ____.

A. in special areas

B. in the suburbs

C. in the neighbourhood of the home

D. in gardens and parks

4. The author says "more obligatory activities can also have a recreative aspect" to ____.

A. suggest that obligatory activities don't need to serious

B. show that recreation activities are very important

C. show how recreation activities have spread wildly

D. suggest how to offer recreation activities around home

5. Why would someone only feel himself at home according to the last paragraph?

A. One lives the very best standard of living.

B. There are too many distractions outside his home.

C. There are few recreations around his house.

D. One needs the street door of his house to be opened always.

题型:填空题

最大增益误差是指最大增益的实测值与()之间的差值。

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