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【单选题】
闸管的管压降Uce不变,基极电流为20微,集电极电流增加到25微安,集电极电流相应增加到2.6毫安,则β=( )。A.
、60
B.
、120
C.
、100
D.
、80
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皮皮学刷刷变学霸
举一反三
【单选题】I. Fill in the blanks with the words given below. Each word may be used only once.(在横线处写上选项的 字母 )
A.
accessible
B.
distant
C.
investigate
D.
subtle
E.
renown
F.
confident
G.
statistics
H.
innovation
I.
ultimate
J.
dramatically K. unknown L. attitudes M. tailored N. genius O. motivate 1. The new study found that those who report experience of flooding express more concern over climate change, see it as less uncertain, and feel more __________ that their actions will have an effect on climate change. 2. Previous psychological research suggests that many people are relatively unconcerned about climate change because they perceive it as a/an ________ issue that will not directly affect them. 3. Recent events in Tunisia ( 突尼斯), Egypt and other countries have shown that increases in the perceived effectiveness of individual and collective action can change ________ and behaviors quickly and dramatically. 4. Most people consider Einstein to be a /an _______, and yet he made an insightful personal observation. 5. As a distinctive value, curiosity means inquisitiveness ( 好追根究底) or eager to __________ and learn more. 6. When you encourage a curious mind, like Einstein’s, you feed the hunger to explore the _________ and test new theories. 7. Recent _________ indicate that increasing numbers of people are pursuing college degrees at advanced ages. 8. Books, online courses, MOOCs, professional development programs, and other resources have never been more abundant or __________, making it easier than ever to make a habit of lifelong learning. 9. Every day, each of us is offered the opportunity to pursue intellectual development in ways that are _________ to our learning style. 10. A CBRE report estimated that 50% of jobs would be redundant by 2025 due to technological __________.
【单选题】与东部相比，下列资源在西部地区具有优势的是： [ ]
A.
土地资源、矿产资源、气候资源
B.
水资源、生物资源、土地资源
C.
生物资源、矿产资源、水能资源
D.
木材资源、草场资源、水资源
【单选题】___ did they say about him?. [ ]
A.
How else
B.
What else
C.
Where else
D.
What other
【多选题】中国跨境电商共经历了哪三个发展阶段?( )
A.
第一阶段：跨境电子商务 1.0 阶段（ 1999 年～ 2003 年）
B.
第二阶段：跨境电子商务 2.0 阶段（ 2004 年～ 2012 年 ）
C.
第三阶段：跨境电子商务 3.0 阶段（ 2013 年至今）
D.
第二阶段： “ 大货时代 ” （ 2004 年～ 2012 年）
【简答题】请大家总结一下上学期对于素描的学习情况。
【单选题】某公司为了扩大其网上商店的销售收入，采取了各种各样的广告宣传和促销手段，但是效果并不明显。该公司重金聘请了专业人士进行市场分析，专业人士认为开通了网上银行的人群才是真正潜在的网上商店的顾客群。于是该公司决定与商业银行合作，在新开通网上银行业务的人群中开展宣传和促销活动。但是三个月后，效果并不理想。 以下哪项为真，最能解释上述结果？（ ）
A.
目前网上商店数量增长很快，广告宣传和推广促销要想有成效，必须有鲜明的特色。才能够打动消费者的心
B.
最近网上银行用户被盗的案件频发，开通网上银行的人因此有所减少
C.
一般来说，刚刚开通网上银行的人需要经过一段时间后才有可能进行网上消费
D.
网上金融服务在知识分子中已经比较普及，他们更希望网上商店能够提供一些特色服务
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