公安消防部队在参与重大灾害事故应急救援中：全身、封闭式防化服、全棉防静电内外衣、正压

下列关于中期妊娠水囊引产错误的是

A．机械刺激促进前列腺素合成与释放

B．禁用于瘢痕子宫

C．适用于利凡诺引产禁忌证

D．感染率较其他方法高

E．应被广泛应用

属于烈性肠道传染病的是（）

A．钩端螺旋体病

B．阿米巴痢疾

C．霍乱

D．副伤寒

E．斑疹伤寒

南水北调中线沿途区1月等温线分布图，读图，回答问题:

小题1:图中丹江口水库出口处和北京两地的平均温差大约是      ，其主要原因是

小题2:京津地区急需调水，分析其水资源短缺的自然原因和社会原因。

小题3:分析华北平原发展农业的自然条件。

Believe it or not，optical illusion can cut highway crashes.

Japan is a case in point．It has reduced automobile crashes on some roads by Rearly 75 percent using a simple optical illusion．Butst．ripes,called chevrons(人字形)，painted on ther rads make drivers think that they are driving faster than they really are，and thus drivers slow down.

Now the American Automobile Association Foundation for Traffic Safety in Washington D．C. is planning t。repeat Japan’s success．Starting next year，the foundati。n will paint cheyrons and。ther pattems of stripes on selected roads around the country to test how well the patterns reduce highway erashes．

Excessive(too great)speed plays a major role in as much as one fifth of all fatal traffic accidents， according to the foundation．To help reduce those accidents，the foundation will conduct its tests in areas where speed-related hazards(danger)are the greatest curves，exit slopes，traffic circles，and bridges．

Some studies suggest that straight，horizontal bars painted across roads can initially cut the average speed of drivers in half．However,traffic。ften returns to full speed within months as driVers become used to seeing the painted bars．

Chevrons，scientists say，not only give drivers the impression that they are driving faster than they reallv are but als0 make a lane appear to be narrower．The result is a longer lasting reduction in highway speed and the number of traffic accidents．

The American Automobile Association Foundation for Traffic Safety plans to（）

A. try out the Japanese method in certain areas

B. change the road signs across the country

C. replace straight, horizontal bars with chevrons

D. repeat the Japanese road patterns

根据微观经济学的观点，以下哪一项是产品转换曲线：（）

A、利润可能性曲线

B、损失可能性曲线

C、销售可能性曲线

D、生产可能性曲线