容器用水进行强度试压时，试压值为工作压力的（）倍，稳压（）小时，压降以不超过试验压力

有关^99mTc-HMPAO描述错误的是（）。

A.脂溶性的Tc-HMPAO在脑内的分布与脑血流成正比

B.^99mTc-HMPAO进入脑组织后固定分布在脑内，并且出现脑内再分布的现象

C.^99mTc-HMPAO主要排泄途径为肝胆道和泌尿系统，24小时排出注射量的40%左右

D.^99mTc-HMPAO具备穿透血脑屏障的脂溶性、零电荷、分子量小三个基本条件

E.^99mTc-HMPAO配制后主张标记后10分钟以内，最迟不超过30分钟使用完毕

Federal regulators Wednesday approved (批准a plan to create a nationwide emergence alert（警报）system using text messages delivered to cell phones.

Text messages have exploded in popularity in recent years, particularly among young people. The wireless industry's trade association, CTIA, estimates（估计）more than 48billion text messages are sent each month.

The plan comes from the Warning Alert and Response Network Act, a 2006 federal law that requires improvements to the nation's emergency alert system. The act tasked the Federal Communications Commission（FCC）with coming up with new ways to alert the public about emergencies.

"The ability to deliver accurate and timely warnings and alerts through cell phones and other mobile services is an important next step in our efforts to help ensure that the American public has the information they need to take action to protect themselves and their families before, and during, disasters and other emergencies," FCC Chairman Kevin Martin said following approval of the plan.

Participation in the alert system by carriers -telecommunications companies is voluntary, but it has received solid support from the wireless industry.

The program would be optional for cell phone users. They also may not be charged for receiving alerts.

There would be three different types of messages, according to the rules.

The first would be a national alert from the president, likely involving a terrorist attack or natural disaster. The second would involve "approaching threats," which could include natural disasters like hurricanes or storms or even university shootings. The third would be reserved for child abduction（绑架）emergencies, or so-called Amber Alerts.

The service could be in place by 2010.

小题1:What is the purpose of the approved plan?

A．To warn people of emergencies via messages.

B．To popularize the use of cell phones.

C．To estimate the monthly number of messages.

D．To promote the wireless industry.小题2:The improvement to the present system is in the charge of________.

A．CTIA                                      B the Warning Alert and Response Network

C．FCC                                       D．federal regulators

小题3:An alert message will NOT be sent if________.

A．a child loses his way

B．a university shooting happens

C．a natural disaster happens

D．a terrorist attack occurs小题4:Which of the following would be the best title for the text?

A．Cell Phone Alerts Protecting Students

B．Cell Phone Alerts by Wireless Industry

C．Cell Phone Alerts of National Disasters

D．Cell Phone Alerts Coming Soon

程序流程图(PFD) 中的箭头代表的是______。

A．数据流

B．控制流

C．调用关系

D．组成关系

冲击试样如果一次无法冲断，可以进行第二次冲击。

电子商务下的物流管理主要具有以下特点（）。

A.综合性特点

B.新颖性特点

C.智能性特点

D.以上都不是