时间系列设计方案需要多个什么点进行最敏感的统计学检验（） A.对照点 B.实验点 C

按设计要求变电站软母线的允许弛度误差为（）。

A、+6

B、+5%～2.5%

C、±5%

D、±2%

用DIS测量不规则固体的密度，实验装置如左图所示。实验步骤如下：

Ⅰ．将质量为9.30×10^-3kg的固体放入注射器内；　

Ⅱ．缓慢推动活塞至某一位置，记录活塞所在位置的容积刻度V及对应的气体压强P；

Ⅲ．重复步骤Ⅱ，记录几组P、V值；

Ⅳ．处理记录的数据，算出固体的密度。

（1）纵坐标取V，横坐标取，请根据表格数据在方格图中画出相应图线；

（2）如果图线与纵坐标的截距为b，b表示的物理意义是____________________，写出图线对应的函数表达式：

____________________；

（3）该固体的密度为________kg/m³。

阅读理解：请根据短文内容，为每题确定l个最佳选项。

The National Trust。

The National Trust in Britain plays an increasingly important part in the preservation for public enjoyment of the best that is left unspoiled of the British countryside. Although the Trust has received practical and moral support from the Government, it is not a rich government department. It is a voluntary association of people who care for the unspoiled countryside and historic buildings of Britain. It is a charity which depends for its existence on voluntary support from members of the public. Its primary duty is to protect places of great natural beauty and places of historical interest.

The attention of the public was the first drawn to the dangers threatening the great old houses and the castles of Britain by the death of the Lord Lothian, who left his great seventeenth-century house to the Trust together with the 4500-acre park and estate surrounding it. This gift attracted wide publicity and started the Trust’s “Country House Scheme” Under this scheme, with the help of the Government and the general public, the Trust has been able to save and make accessible to the public about 150 of these oil houses. Lats year, about 1.75 million people paid to visit these historic houses, usually at a very small charge.

In addition to country houses and open spaces, the Trust now owns some examples of ancient wind and water mills, nature reserves, 540 farms and nearly 2500 cottages or small village houses, as well as some complete villages. In these villages no one is allowed to build, develop or disturb the old village environment in any way and all the houses are maintained in their original 16th century style. Over 4,000 acres of coastline , woodland, and hill country are protected by the Trust and no development or disturbances of any kind are permitted. The public has free access to these areas and is only asked to respect the peace, beauty and wildlife.

Over the past 80 years the Trust has become a big and important organization and an essential and respected part of national life. It helps to preserve all that and of historical significance not only for future generations of Britons but also for the millions of tourists who each year invade Britain in search of a great historic and cultural heritage.

The word “invade” in Paragraph 4 is closet in meaning to______.

A.Come in without permission.

B.Enter with invitation.

C.Visit in large numbers.

D.Appear all of a sudden.

滤过手术失败最常见、最主要的原因是（）

A.合并有全身疾患

B.患者房角完全关闭所致

C.结膜下组织纤维化及滤过泡瘢痕形成

D.未及时应用药物

E.术前眼压过高

下列可以成为商业秘密的是（）

A、工序

B、制作工艺

C、配方

D、造假的方法