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听力原文:W: Dr. Steven, I am thinking about changing my major before the end of the freshman year. M: What are you studying now? W: I am taking three general requirements, American history and American literature this semester. Last semester I took four requirements and freshman French. M: I believe it's not too late to change your major because you've mainly taken general requirements which all freshmen have to take. Also we have twelve electives which include the two literature courses, so you can change your major without losing any credit hours. W: I'm very happy to know I am still able to change my major. I am interested in writing newspaper articles, and after finishing my degree I would like to work for some newspaper firm. M: Oh, I think you will be a good writer. W: Dr. Steven, when do students start practical training? M: They don't begin practical training in reporting until the sophomore year. Joumalism normally is taken in the freshman year as a general background course. W: I see. I will take the course next semester. Thank you very much. M: You're welcome. I look forward to seeing you in my department. (27)
A.
Dean of Students.
B.
Lecturer in Speech Communication.
C.
Professor of Business Administration.
D.
Head of the Journalism Department.
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【简答题】已知某个物体走过的路程 s (单位:m)是时间 t (单位:s)的函数: s =- t 2 +1. (1) t =2到 t =2.1;(2) t =2到 t =2.01;(3) t =2到 t =2.001. 则三个时间段内的平均速度分别为________,________,________,估计该物体在 t =2时的瞬时速度为________.
【多选题】市场细分时,下列属于消费者心理变量的有
A.
宗教信仰
B.
社会阶层
C.
生活方式
D.
个性特征
E.
品牌忠诚
【简答题】某物体运动时,其路程S与时间t(单位:s)的函数关系是S=2(1-t) 2 ,则它在t=2s时的瞬时速度为______
【简答题】在重力的作用下物体从离地面高100米处自由下落,不计空气阻力时,物体的下落路程s与时间t满足关系式s=1/2gt2,其是,则这个函数的定义域是( )
【单选题】电力机车的构架向轮对传递垂向力,纵向力和横向力的主要构件是( )
A.
端梁
B.
枕梁
C.
牵引梁
D.
侧梁
【单选题】信号端子或24V电源端子每排须预留____以上的端子以作备用。
A.
5%
B.
10%
C.
15%
D.
20%
【单选题】炉渣碱度是脱硫的关键因素,中等规律是炉渣碱度愈高,脱硫能力( )。
A.
无关系
B.
愈弱
C.
愈强
【单选题】空气不干燥,四季无风沙,年平均气温在( )左右。
A.
10℃
B.
20℃
C.
15.3℃
D.
24℃
【单选题】某物体做变速直线运动,其路程函数为 s=t 3 ,则该物体在 t=2 时的速度为( )。
A.
3
B.
6
C.
9
D.
12
【单选题】电力机车的构架向轮对传递垂向力,纵向力和横向力的主要构件是()。
A.
端粱
B.
枕粱
C.
牵引粱
D.
侧粱
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