根的维管组织内由导管、管胞、筛管、伴胞、纤维等组成()系统,由维管射线组成()系统。

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问题:

根的维管组织内由导管、管胞、筛管、伴胞、纤维等组成()系统,由维管射线组成()系统。

考点:农学植物学综合试题植物学综合试题题库
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已知次氯酸和次氟酸的分子结构相似,分子中所有原子都形成了稳定结构。下列说法不正确的是

A.次氯酸的结构式为H—O—Cl

B.严格说来,次氯酸的分子应写为HOCl

C.次氟酸应具有很强的氧化性

D.次氟酸中氧元素的化合价为+1价

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电气设备的额定电压是在产品设计时就被选定的。第八章

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The simple act of surrendering a telephone number to a store clerk may seem innocuous—so much so that many consumers do it with no questions asked. Yet that one action can set in motion a cascade of silent events, as that data point is acquired, analyzed, categorized, stored and sold over and over again. Future attacks on your privacy may come from anywhere, from anyone with money to purchase that phone number you surrendered. If you doubt the multiplier effect, consider your e-mail inbox. If it’s loaded with spam, it’s undoubtedly because at some point in time you unknowingly surrendered your e-mail to the wrong Web site.

Do you think your telephone number or address are handled differently A cottage industry of small companies with names you’ve probably never heard of—like Acxiom or Merlin—buy and sell your personal information the way other commodities like corn or cattle futures are bartered. You may think your cell phone is unlisted, but if you’ve ever ordered a pizza, it might not be. Merlin is one of many commercial data brokers that advertises sale of unlisted phone numbers compiled from various sources—including pizza delivery companies. These unintended, unpredictable consequences that flow from simple actions make privacy issues difficult to grasp, and grapple with.

In a larger sense, privacy also is often cast as a tale of "Big Brother"—the government is watching you or a big corporation is watching you. But privacy issues don’t necessarily involve large faceless institutions: A spouse takes a casual glance at her husband’s Blackberry, a co-worker looks at e-mail over your shoulder or a friend glances at a cell phone text message from the next seat on the bus. While very little of this is news to anyone—people are now well aware there are video cameras and Internet cookies everywhere—there is abundant evidence that people live their lives ignorant of the monitoring, assuming a mythical level of privacy. People write e-mails and type instant messages they never expect anyone to see. Just ask Mark Foley or even Bill Gates, whose e-mails were a cornerstone of the Justice Department’s antitrust case against Microsoft.

And polls and studies have repeatedly shown that Americans are indifferent to privacy concerns. The general defense for such indifference is summed up a single phrase: "I have nothing to hide. " If you have nothing to hide, why shouldn’t the government be able to peek at your phone records, your wife see your e-mail or a company send you junk mail It’s a powerful argument, one that privacy advocates spend considerable time discussing and strategizing over.

It is hard to deny, however, that people behave different when they’re being watched. And it is also impossible to deny that Americans are now being watched more than at any time in history.

To the popular saying "I have nothing to hide," the author’s response is one of()

A.admiration

B. contempt

C. disapproval

D. puzzlement

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大脑皮质建立的运动动力定型越多,改建就越 ( )

A.容易

B.不容易

C.没区别

D.无法完成

题型:填空题

保育员职业道德的重要作用有哪些?

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