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Direction: Read the passage below and finish the questions according to the passage. Note that you should finish 3 and 5 in complete sentence. When it comes to friends, I desire those who will share my happiness, who possess wings of their own and who will fly with me. I seek friends whose qualities illuminate (照亮) me and train me up for love. It is for these people that I reserve the glowing hours, too good not to share. When I was in the eighth grade, I had a friend. We were shy and 'too serious' about our studies when it was becoming fashionable with our classmates to learn acceptable social behavior. We said little at school, but she would come to my house and we would sit down with pencils and paper, and one of us would say, 'Let's start with a train whistle today.' We would sit quietly together and write separate poems or stories that grew out of a train whistle. Then we would read them aloud. At the end of that school year, we, too, were changing into social creatures and the stories and poems stopped. When I lived for a time in London, I had a friend. He was in despair and I was in despair. But our friendship was based on the idea in each of us that we would be sorry later if we did not explore this great city because we had felt bad at the time. We met every Sunday for five weeks and found many excellent things. We walked until our despairs disappeared and then we parted. We gave London to each other. For almost four years I have had a remarkable friend whose imagination illuminates mine. We write long letters in which we often discover our strangest selves. Each of us appears, sometimes in a funny way, in the other's dreams. She and I agree that, at certain times, we seem to be parts of the same mind. In my most interesting moments, I often think, 'Yes, I must tell...' We have never met. It is such comforting companions I wish to keep. One bright hour with their kind is worth more to me than the lifetime services of a psychologist, who will only fill up the healing silence necessary to those darkest moments in which I would rather be my own best friend. 1. When I was in the eighth grade, we did not learn acceptable social behavior because ______. 2. According to paragraph three, we gave London to each other by ______. 3. In the author's opinion, what kind of person can be regarded as a friend? ___________________________________________________________________________ 4. In the darkest moments why does the author prefer to stay with her best friend? ___________________________________________________________________________
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【单选题】有关内燃机配气机构,下列关于该机构说法错误的是
A.
该机构为盘形凸轮与平底式从动件组合
B.
从动件的运动规律由凸轮轮廓曲线决定
C.
从动件在垂直于凸轮轴的平面内运动
D.
盘形凸轮主要用于从动件形成较大的场合
【单选题】在公交车上,看到怀抱婴儿的妇女就主动让座,这种助人为善、助人为乐的行为,会产生愉悦感的内心体验。这是个人品德的形成过程中的( )。
A.
道德认识
B.
道德信念
C.
道德情感
D.
道德意志
【多选题】关于凸轮机构,下列说法正确的是:
A.
凸轮机构的从动件可以是移动的,也可以是摆动的
B.
凸轮机构中最耐磨损的接触形式是尖顶接触
C.
平底接触凸轮主要用于高速运动场合
D.
从动件与凸轮保持接触的方法有力封闭和几何封闭等
【简答题】单缸内燃机的气阀启闭装置:(6分) (1)该机构采用____类型的凸轮机构, 以凸轮为主动件做等速转动,带动____做往 复移动,实现气阀____动作; (2)主、从动件接触属于高副运动副形式,从动 件端部采用____结构形式,其接触主要特点是____; (3)主、从动件紧密接触主要靠机构中____实现。
【单选题】在公交车上,看到怀抱婴儿的妇女就主动让座,这种助人为善、助人为乐的行为,会产生愉悦感的内心体验。这是个人品德的形成过程中的( )。
A.
道德认识
B.
道德情感
C.
道德信念
D.
道德意志
【多选题】关于凸轮机构,下列说法正确的是:
A.
凸轮机构的从动件可以是移动的,也可以是摆动的
B.
凸轮机构中最耐磨损的接触形式是平底接触
C.
平底接触凸轮主要用于高速运动场合
D.
从动件与凸轮保持接触的方法有力封闭和几何封闭等
【单选题】某一商品相对价格上升,将导致( )
A.
该商品密集使用的生产要素的名义收入下降
B.
该商品密集使用的生产要素的实际收入上升
C.
另一种生产要素名义收入上升
D.
另一种生产要素实际收入上升
【简答题】题图所示组合机构是通过主轴上的凸轮1和3控制输出构件5,使它完成矩形轨迹来运输零件。试分析这是什么形式的组合系统,并画出运动框图。
【单选题】下列哪几个说法正确,收缩将使混凝土结构(1)变形增加、(2)产生裂缝、(3)预应力钢筋应力损失、(4)强度降低:
A.
(2),(4)
B.
(1),(3),(4)
C.
(1),(2),(3)
D.
(3),(4)
【单选题】收缩将使混凝土结构:(1)变形增加;(2)产生裂缝;(3)预应力钢筋应力损失;(4)强度降低。 下列说法正确的是()。
A.
(2)、(4)
B.
(1)、(3)、(4)
C.
(1)、(2)、(3)
D.
(3)、(4)
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