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【单选题】
Americans with small families own a small car or a large one. If both parents are working, they usually have two cars. When the family is large, one of the cars is sold and they will buy a van.A small car can hold four persons and a large car can hold six persons but it is very crowded. A van holds seven persons easily, so a family with three children could ask their grandparents to go on a holiday travel. They could all travel together.Mr. Hagen and his wife had a third child last year. This made them sell a second car and buy a van. Their children’s sixth and seventh seats are used to put other things, for a family of five must carry many suitcases when they travel. When they arrive at their grandparents’ home, the suitcases are brought into the two seats which can then carry the grandparents.Americans call van motor homes. A motor home is always used for holidays. When a family is traveling to the mountains or to the seaside, they can live in their motor home for a few days or to the seaside, they can live in their motor home for a few days or weeks. All the members of a big family can enjoy a happier life when they are traveling together. That is why motor homes have become very popular. In America there are many parks for motor homes.Motor homes have become popular because .
A.
they can take people to go out for their holidays
B.
they can make families have a happier life when they go out for their holidays
C.
some people think motor homes are cheap for them
D.
big families can put more things in them when they go out for their holidays
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【判断题】利维斯认为文化的精华部分就在文学里。()
A.
正确
B.
错误
【单选题】下列关于运动副的说法错误的是( )
A.
低副的优点:制造和维修容易 ,单位面积压力小 ,承载能力大 。
B.
低副的缺点:由于是滑动 摩擦,摩擦损失比高副 大,效率低 。
C.
两构件之间作面接触 的运动副,叫高副。
D.
运动副的两构件之间,接触形式有点 接触,线 接触和面 接触三种。
【判断题】快速原型技术的适用于软件产品要求大量的用户交互、或产生大量的可视输出、或设计一些复杂的 算法等场合。
A.
正确
B.
错误
【单选题】可造成所测血压值偏低的因素是
A.
充气过高
B.
充气过猛
C.
所缠袖带过紧
D.
所缠袖带过窄
E.
所缠袖带过松
【单选题】下列说法不正确的是
A.
低副单位面积承受载荷的能力较大,可用于传力机构
B.
高副能传递较复杂的运动
C.
低副是滑动摩擦,摩擦损失大, 效率低
D.
高度是点接触或面接触,制造维护方便
【单选题】— I wonder how long you _____ in Beijing. — Just for the weekend, then I had to attend a conference in Tianjin. [     ]
A.
will stay
B.
stayed
C.
have stayed
D.
stay
【简答题】计算下列反应的ΔG,并判断反 应的自发方向。 C6H12O6(s)+ 6O2(g)= 6CO2(g)+ 6H2O(l)
【单选题】— How is that, Mary? — I wonder ________ it takes to be a good teacher beyond patience and a great knowledge of kids. [      ]
A.
how is it that
B.
what it is that
C.
how it is that
D.
what is it that
【判断题】低副的效率低,承载能力低;高副的效率高,承载能力大
A.
正确
B.
错误
【简答题】低副的特点有 1.通过 接触 2.承受载荷时单位 压力较 (低/高) 3.承载能力 (大/小) 4. (难/易) 于制造维修, 5.但效率 (高/低)
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