什么是数据库的二级映象功能?

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问题:

什么是数据库的二级映象功能?

考点:计算机科学技术计算机数据库系统原理计算机数据库系统原理题库
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The Apple iPhone’s impact was widely evident (明显的) at the Consumer Electronics Show, as new touch-screen devices could be found everywhere.

The consumer electronics industry came unbuttoned in Las Vegas this week. At the annual Consumer Electronics Show, companies from around the world unveiled many devices boasting (以拥有…而自豪) touch – sensitive technology, rather than traditional push-button controls.

Motorola, Sony, and LG Electronics all showed off touch-screen phones this week. Microsoft Chairman Bill Gates praised and offered a touch-screen computer, the Surface, related to a flat panel TV for a tabletop. Even camera makers, such as Kodak,included touch-screen LCDs in their devices. Touch-screen tech has been in use for years,but the push to develop and weave it into consumer electronics gathered steam with the June introduction of Apple’s iPhone. “The touch-screen industry is really getting hot,” says Jennifer Colegrove, a senior analyst at iSuppli. “Since the iPhone came out, there are a lot of companies that did not have a relationship with touch screens before that decided, ‘OK, I want to make a touch screen, too.’”

The touch-screen tech ecosystem now includes more than 100 companies specializing in everything from smudge-proof (防污的) screens to sensors (传感器) able to detect fingers before they even contact the screen. Sales of leading touch-screen technologies,such as those used in mobile phones and navigation (航行) devices,are expected to rise to $ 4.4 billion in 2012, up from $ 2.4 billion in 2006,according to iSuppli estimates.

小题1:What did the writer think about the Apple iPhone?

A.The Apple iPhone was beautiful.

B.The Apple iPhone was popular.

C.The Apple iPhone was expensive.

D.The Apple iPhone was attractive.小题2:What is the meaning of the underlined word “unveiled” in the second paragraph?

A.Invented.

B.Unlocked.

C.Discovered.

D.Showed.小题3:The touch-screen tech was used in consumer electronics mainly because of _______.

A.traditional push-button controls

B.Microsoft Chairman Bill Gates

C.the introduction of Apple’s iPhone

D.the touch-screen tech ecosystem小题4:What can we learn from the passage?

A.The touch-screen technology will disappear.

B.The touch-screen technology will be replaced by traditional push-button controls.

C.The touch-screen technology will be as important as traditional push-button controls.

D.The touch-screen technology will be more widely used in electronics devices.

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女,40岁,有慢性乙型肝炎30余年,一年前胃镜发现食管静脉轻度曲张,半年来进行性腹部隆起,双下肢水肿,患者两年前闭经,婚后一直未孕。

患者的闭经、不孕可能由于().

A.雄激素过多

B.雌激素过少

C.肾上腺皮质激素过少

D.孕激素过多

E.雌激素过多

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低变反应器床层超温的最主要危害是()

A、反应器出口一氧化碳超标

B、影响再生塔重沸器的运行

C、影响工业氢的质量

D、降低低变催化剂的活性

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加油站制定(),根据站内情况,建立完善党团小组,并定期组织站内党团员参加支部组织活动。

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可以设定行政许可的有法律、行政法、()、()、()。

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