同步电击复律的同步触发装置利用患者心电图中的R波来触发，在心动周期的哪一时期发放电流

某运输公司从汽车销售商处购入十辆东风卡车，销售商以购货发票金额为这些卡车投保50万元，东风卡车的质量认证机构认证的质量保证期为6年，在投保后因汽车质量不合格而引起了停业10天而损失10万元，为了继续营业而租用另一运输公司的车辆而付租金20万。

该案例中销售商所投保的险种为（）。

A.产品责任保险

B.产品质量保证保险

C.雇主责任保险

D.忠诚保证保险

估算75÷9时，可以把75看作______，而______÷9=______，所以75÷9≈______．

对病毒衣壳错误的叙述是（）

A.由多肽构成的壳粒组成

B.表面凸起称刺突

C.可增加病毒的感染性

D.呈对称形式排列

E.可抵抗核酸酶和脂溶剂

以下前列腺癌MRI表现描述不正确的是（）

A.MRI不易显示发生于前列腺移行带和中央带的早期癌

B.MRI显示前列腺癌主要靠在T₂加权像

C.如果前列腺薄膜模糊、中断，可肯定包膜受侵

D.应用直肠内线圈对判断肿瘤有无穿透前列腺包膜最为理想

E.精囊受侵表现T₁WI呈低信号

阅读理解。

      Greenspace facilities (设施) are contributing to an important degree to the quality of the city

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-proved

statement than on the base of a closely reasoned scientific proof. Recognizing the importance of

greenspaces in the city environment is a first step on the right way, this does not mean, however, that

enough details are known about the functions of greenspace in towns and about the way in which people

are using these spaces. As to this subject I shall within the scope (范围) of this lecture, enter into one

aspect only, namely the recreative function of greenspace facilities.  

     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 more attention for forms of recreation

far from home, while 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 city environment has to offer as many recreation activities as possible, and the design of these has to

be such that more required activities can also have 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 for 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. The importance of greenspaces in the city environment _____.  

A. is still unknown                        

B. is paid little attention to  

C. is accepted on the base of scientific proof    

D. has been recognized

2. For many years town and country planning has _____.  

A. brought living areas and places of entertainment close together  

B. separated recreation facilities far from home  

C. improved recreative possibilities in the neighborhood  

D. enabled people to reach the best standard of living  

3. What does the writer recommend to create a better environment?

A. Providing a recreation place.        

B. Creating more separated greenspace

C. Owning greenspace facilities.      

D. Delivering a free service.

4. The word "recreation" in the passage probably means _____.

A. activities done for pleasure or enjoyment    

B. doing something again in a creative way  

C. doing something important after work      

D. required activities done after work  

5. According to the author, greenspaces should be designed _____.  

A. to reduce the number of recreative activities  

B. to attract more and more people  

C. for people to use more conveniently        

D. for people to do recreative activities at the street door of the house

6. The main idea of this passage is that _____.  

A. attention must be paid to the improvement of recreation  

B. greenspace facilities should be used better to improve the quality of life  

C. the city environment is providing more recreative activities  

D. we should try our best to raise our living standard