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Discover A science magazine, designed for wonders of modern science, written for the educated general readers. Published by Disney Magazine Publishing Co., Discover tells many of the same stories professionals (专业人员) read in Scientific American . A truly delightful family science ma gazine, each issue (每期) brings new topics to make dinner time and water-cooler conversations interesting. Cover Price: $59.88 Price: $19.95($1.66/issue) You Save: $39.93(67%) Issues:12 issues/12months Self Published by Conde Nast Publications Inc., Self is a handbook designed for women’s overall physical and mental health. Every issue contains usable articles such as “Style Lab”, in which wearable clothes are mixed and matched on non-modles and the “Eat Night Road Map”, with tips on how to eat properly. Cover Price: $35.86 Price: $15.00($2.5/issue) You Save: $20.86(58%) Issues: 10issues/12months Instyle Instyle is a guide to the lives and lifestyle of the world’s famous people. The magazine covers the choices people make about their homes, their clothes and their free time activities. With photos and articles, it opens the door to these people’s homes, families, parties and weddings, offering ideas about beauty, fitness and in general, lifestyles. Publisher: The Time Inc. Magazine Company. Cover Price: $47.88 Price: $23.88($2.38/issue) You Save: $24.00(50%) Issues: 10 issues/12months Wired This magazine is designed for leaders in the field of information engineering including top managers and professionals in the computer, business, and education industries. Published by Conde Nast Publications Inc. , Wired often carries articles on how technology changes people’s lives. Cover Price: $59.40 Price: $10.00($1.00/issue) You Save: $49.40(83%) Issues: 10 issues/12months 小题1:Which two magazines are published by the same publisher? A. Wired and Instyle B. Discover and Instyle C. Self and Discover D. Self and Wired 小题2: Which magazine offers the biggest price cut? A. Instyle B. Wired C. Discover D. Self 小题3: The “Style Lab” in Self provides readers with articles which _________. A.offer advice to ordinary women on clothes. B.show how a woman can become famous C.introduced places with the best food D.discuss ways of training models
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参考答案:
举一反三
【单选题】下面哪种情况表明,NPN型三极管工作一定在线性放大区?
A.
发射极的电位(Ve)低于集电极的电位(Vc)。
B.
基极的电位(Vb)高于发射极的电位(Ve)。
C.
集电极的电流(Ic)和基极的电流(Ib)之比等于电流放大系数 β 。
D.
基极的电流( Ib )不等于零。
【简答题】常见的易燃气体有哪些?
【简答题】常见的易燃液体有哪些?举出五例。经常遇到的可燃气体有哪些?举出五例。
【简答题】常见的气体有哪些?
【判断题】根据法律规定,扑救森林火灾是公安机关的法定职责。
A.
正确
B.
错误
【简答题】为了保证三极管工作在放大区,应使发射结 偏置,集电结 偏置。对于NPN型三极管, 0.7V, 0.4V 。
【单选题】对于 NPN 型三极管 , 工作于放大区时 , 应该满足 ( )
A.
UC>UB>UE
B.
UC>UE>UB
C.
UB>UC>UE
【简答题】为了保证三极管工作在放大区, 对于NPN型三极管,应使V BC 0(大于或小于)。
【简答题】为了保证三极管工作在放大区,要求: 1发射结 偏置,集电结 偏置。2对于NPN型三极管,应使V BC 。
【简答题】为了保证三极管工作在放大区,应使发射结 偏置,集电结 偏置。对于 NPN 型三极管, U BE 于零, U BC 于零。
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