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问题 问答题

如图是小聪在研究萘熔化时温度变化规律的T-t 图象，观察图象并回答以下问题

（1）图上bc 段表示萘的熔化过程, 此时萘处于        状态，该过程持续了       min ，萘在该过程不断_____热，温度_____（选填“升高”、“降低”或“不变”）

（2）萘是一种        (填“晶体”或“非晶体”)，萘的熔点是        。

答案

（1）固液共存；3 ；吸；不变     

（2）晶体；80 ℃

单项选择题

下列药物中，属于单酰胺菌素类的代表品种的是（）。

A.头孢西丁

B.头孢美唑

C.亚胺培南

D.美罗培南

E.氨曲南
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单项选择题

With hundreds of millions of electronic (46) taking place daily, businesses and organizations have a p incentive to protect the (47) of the data exchanged in this manner, and to positively ensure the (48) 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 (49) that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in (50) 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.

A. appliances B. chips C. tools D. means
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