如果承包商遇到不可预见的物质条件，并发出通知，则承包商可以索赔( )。A．工期、费

( )是明清北京皇城北门。

A． * *

B．神武门

C．安定门

D．地安门

“神舟八号”飞船与“天宫一号”在今年11月已顺利完成了两次无人对接实验。如图是“天宫一号”和“神舟八号”绕地球做匀速圆周运动的假想图，A代表“天宫一号”，B代表“神舟八号”，虚线为各自的轨道。根据此假想图，可以判定：

A.“天宫一号”的运行速度大于第一宇宙速度

B.“神舟八号”只有加速才可能与“天宫一号”实现对接

C.“天宫一号”的向心加速度大于“神舟八号”的向心加速度

D.“天宫一号”的周期小于“神舟八号”的周期

属于控制权变更型公司重组的有( )。

A．收购股份

B．股权的协议转让

C．股权的无偿划拨

D．收购公司

关于普萘洛尔的叙述，哪项是错误的：

A．降低窦房结、心房及浦肯野纤维自律性

B．减慢房室结及浦肯野纤维的传导速度

C．窦性心动过速首选

D．缩短房室结ERP

E．较高浓度时有膜稳定作用

When President Obama took the stage here Wednesday to address a community--and a nation-- traumatized by Saturday’s shooting rampage in Tucson, Arizona, it invited comparisons to President George W. Bush’s speech to the nation after the attacks of Sept. 11, 2001, and the memorial service President Bill Clinton led after the bombing of a federal office building killed 168 people in Oklahoma City in 1995. But Mr. Obama’s appearance presented a deeper challenge, reflecting the tenor of his times. Unlike those tragedies which, at least initially, united a mournful country and quieted partisan divisions--this one has, in the days since the killings, had the opposite effect, inflaming the divide.
It was a political reality Mr. Obama seemed to recognize the moment he took the stage. He directly confronted the political debate that erupted after the rampage, asking people of all beliefs not to use the tragedy to turn on one another. He called for an end to partisan recriminations, and for a unity that has seemed increasingly elusive as each day has brought more harsh condemnations from the left and the right. It was one of the more powerful addresses that Mr. Obama has delivered as president, harnessing the emotion generated by the shock and loss from Saturday’s shootings to urge Americans "to remind ourselves of all the ways that our hopes and dreams are bound together. \