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【单选题】
Child Consultants These days, 'what do you want to do when you grow up?' is the wrong question to ask children in the USA. The_______(51) should be: 'what job are you doing now?' American companies are employing more and more young people as consultants to evaluate products for child_______(52). The 12-to-19_______ (53) group spends more than $ 100 billion a year in the USA. Specialist agencies have been created to help manufacturers ask kids about all the latest trends in clothes, food and _______( 54 ) markets. One_______ (55), Teenage Research Unlimited, has panels (评判小组) of teenagers who give their verdict (裁决) on products_______(56) jeans (牛仔裤). Another company, Doyle Research Associated, holds two-hour sessions in a room_______(57) the 'imaginarium (想象室)' Children are encouraged to play games to get _______(58) a creative mood. They have to write down any ideas that_______(59) into their heads. Some manufacturers prefer to do their own_______(60) research. The software company Microsoft runs a weekly 'Kid's Council' at its headquarters in Seattle, _______(61) a panel of school children give their verdict on the______(62) products and suggest new ones. One 11 -year-old, Andrew Cooledge, told them that they should make more computer games which would appeal equally______(63) boys and girls. Payments for the work are increasingly attractive. Andrew Cooledge was paid $ 250. and given some software______(64) , even if their ideas are valuable, the children will never make a fortune. They cannot have the copyright to their ideas. These are not jobs they can hold for long they are too old. ______(65) their mid-teens they can be told that they are too old.
A.
sentence
B.
word
C.
answer
D.
question
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【简答题】如下图所示电路,已知: E=100V , R =4Ω, Em=20V,采用脉宽调制控制方式,t on =40μs, T=60μs,忽略开关导通压降,电感 L 足够大。 (1)判断该电路是何种电路。 (2)画出负载电压 U O 波形。 (3)计算输出电压平均值 U O ,输出电流平均值I 0 。
【简答题】如图2—7所示的电路,已知R1=2Ω,R2=4Ω,L=1H,C=0.5F,uS(t)=2e-tu(t)V,列出i(t)的微分方程,求其零状态相应。 系统在激励下的全响应。
【简答题】如题2.5图所示的电路,已知R 1 =2Ω,R 2 =4Ω,L=1H,C=0.5 F,u s (t)=2e -τ ε(t)V,列出i(t)的微分方程,求其零状态响应。
【单选题】依法应当招标的项目,在下列情形中,可以不进行施工招标的情形是( )。(2015年二级建造师法规)
A.
技术复杂,有特殊要求的
B.
已通过招标方式选定的特许经营项目投资人依法能够自行建设、生产或者提供的
C.
采购人自行建设、生产或者提供更为节省成本的
D.
需要向原中标人采购工程、货物或者服务,否则所需要费用将大幅增加
【简答题】‍ 电路如图 4 所示 , 已知 u (t) =4e - 3t , i L ( 0 ) =0 ,求 i R ( t ) 、 i L ( t ) 、 i C ( t ) 。 图4 ‍
【单选题】已知电路如图所示,求电容电流 i ( t ) ( )A。
A.
2(1-e -0.5 t ) ɛ( t-2 )
B.
2 e -0.5 t ɛ( t-2 )
C.
4 e -2 t ɛ( t )
D.
2e -2 t ɛ( t )
【简答题】下列程序的输出结果是什么? class Demo{ int temp = 30 ; // 此处为了方便,属性暂时不封装 }; public class RefDemo01{ public static void main(String args[]){ Demo d1 = new Demo() ; // 实例化Demo对象,实例化之后里面的temp=30 d1.temp = 50 ; // 修改t...
【简答题】如图所示电路,已知R 1 =2Ω,R 2 =4Ω,L=1H,C=0.5F,us(t)=2e -t ε(t)V,列出i(t)的微分方程,求其零状态响应。
【单选题】如图所示电路,已知 i ( t )=4e -3 t A ,则 u ( t ) 为( )。
A.
–12 -3t V
B.
–6e -3t V
C.
6e -3t V
D.
12e -3t V
【简答题】如图所示的电路,已知R 1 =2Q,R 2 =4Q,L=1H,C=0.5F,us(t)=2e -t (t)V,试列出i(t)的微分方程,求其零状态响应。
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