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问题 单项选择题

与TOF法MRA相比，PC法MRA的优点不包括（）

A.可以进行血液流速和流量检测

B.背景组织信号抑制更佳

C.成像时间更短

D.平行于扫描层面的血管显示较好

E.慢速的小血管显示较好

答案

参考答案：C

计算题

(10分) 向氢氧化钠溶液中慢慢地通入二氧化硫气体，反应生成正盐，当继续通入过量二氧化硫时，正盐便转化成酸式盐。

⑴写出上述反应的化学方程式①                                          

②                                                                          

⑵标准状态下，向100mL2mol／L的NaOH溶液中通入3.36L二氧化硫气体，反应后溶液中溶质的成分为                                                 。

⑶试计算，在标准状态下，100mL2mol／L的NaOH溶液中最多可吸收多少体积二氧化硫气体？
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单项选择题

With hundreds of millions of electronic（）taking place daily, businesses and organizations have a p incentive to protect the（）of the data exchanged in this manner, and to positively ensure the（）of those involved in the transactions. This has led to an industry-wide quest for better, more secure methods for controlling IT operations, and for deploying p security mechanisms deeply and broadly throughout networked infrastructures and client devices. One of the more successful concepts to engage the imaginations of the security community has been the development of standards-based security（）that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in（）and integrating security provisions at the deepest levels of the machine operation has significant benefits for both users and those responsible for securing IT operations.

With hundreds of millions of electronic（）taking place daily.

A．devices

B．transactions

C．communications

D．businesses
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