产品生命周期的含义及特征是什么？

临床用血的法律规定有哪些？

肝脏的功能不包括（）

A.参与蛋白质合成

B.参与脂类转化

C.药物的转化和解毒

D.参与糖类和维生素分解

E.产生并储存胆汁

A camera and a computer can “see” something that perhaps millions of pairs of eyes failed to see for 480 years: the Mona Lisa’s necklace. The discovery about the famous painting was made by an American physicist.

The Mona Lisa, painted by the Italian, Leonardo da Vinci, has been on show for many years in Paris. Now a row of white spots on the neck have been “seen”. They are said to be the remains (痕迹) of a necklace which the artist later painted over.

The painting will be examined further by using infrared scanning (红外线扫描) techniques. Laser (激光) technology can be used to show what lies directly under the surface of the finished work, too. This will help us to understand how the artist drew the picture: Did he begin with a quick-made drawing or have second thoughts as he painted the picture?

This kind of knowledge will show us the famous artist at work. It may also help to explain Mona Lisa’s smile, which has puzzled art lovers for centuries.

小题1:This passage is mainly about ______.

A．the famous artist Leonardo da Vinci

B．an American physicist’s discovery

C．further researches on the Mona Lisa

D．The uses of modern technology小题2:The Mona Lisa is ______.

A．a famous artist

B．a famous painting

C．a smiling woman

D．a lost necklace小题3:In this passage, “the Mona Lisa’s lost necklace” suggests that ______.

A．Mona Lisa once wore a necklace

B．someone stole the necklace from the Mona Lisa

C．the artist did not keep the necklace he had painted on the neck

D．the artist had a necklace stolen while working on the painting小题4:According to the passage, the white spots on Mona Lisa’s neck ______.

A．are still invisible to visitors

B．have turned into a necklace

C．have already appeared before visitors

D．are looking more and more like a necklace小题5:The painting will be examined further so that people may know more about ______.

A．Mona Lisa and her smile

B．the time when it was finished

C．infrared scanning and laser

D．this art work and the artist

冷却路环水常用的冷却方法有（）、（）、（）。

在风险管理中，风险识别的主要内容包括（）。

A.感知风险和分析风险

B.预测风险和消除风险

C.感知风险和消除风险

D.预测风险和分析风险