什么叫生长因子,它包括哪些化合物?什么叫原生营养型?什么叫营养缺陷型?

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问题:

什么叫生长因子,它包括哪些化合物?什么叫原生营养型?什么叫营养缺陷型?

考点:生物学微生物学绪论微生物学绪论题库
题型:问答题 简答题

For each blank, choose the best answer from the four choices and write down on the answer sheet.
Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with (71) , and that it has a mechanism for (72) graphical fries. Display text, display graphics, and (73) hyperlinks-there’ s 99 percent of the (74) value. That’s not to say that the manufacturers didn’t go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can’t wait to delete from your favorites of bookmarks menu Remember when client - side Java applets were supposed to become the preferred (75) for application development Remember frames and all their nasty side effects

A.superlinks

B.links

C.hyperlinks

D.connections

题型:问答题 简答题

瀑布模型突出的缺点是不适应()的变动。

A.软件结构

B.运行平台

C.用户需要

D.程序语言

题型:问答题 简答题

如图所示,把两个小灯泡串联接入电路研究串联电路特点.

(1)开关闭合并且两灯都发光时,取下其中一个灯,可观察到______现象;

(2)在串联的两个小灯电路中再串联一个小灯,闭合开关后可观察到______现象;

(3)以上两个现象都说明了串联电路______这一特点.

题型:问答题 简答题

“贸易方式”栏应填()。

A.进料对口

B.进料加工

C.外资设备物品

D.来料加工

题型:问答题 简答题

熊彼特认为,正是由于企业家群体的创新,才推动了社会经济的发展。熊彼特所说的创新活动不包括()

A.引进一种新产品

B.开辟一个新市场

C.实现新的企业组织形式

D.扩大生产规模

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