【判断题】【消耗次数:1】
挠度向下为正,转角逆时针转向为正。
正确
错误
参考答案:
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相关题目
【判断题】 规定位移法的杆端弯矩正负号时,对杆端以顺时针为正,对结点以逆时针为正,这一规定也适合于杆端剪力的正负号规定。
①  正确
②  错误
【判断题】 剪力是截面上应力沿轴线法向的合力,以绕隔离体逆时针转为正。
①  正确
②  错误
【判断题】 截面上的剪力使研究对象有逆时针转向趋势时取正值。
①  正确
②  错误
【多选题】 影响转向器正效率的因素有()。
①  制造工艺;
②  制造质量;
③  结构特点;
④  转向系类型
【单选题】 在下面关于梁、挠度和转角的讨论中,结论正确的是:( )。
①  挠度的一阶导数等于转角
②  挠度最大的截面转角最大
③  转角为零的截面挠度最大
④  挠度最大的截面转角为零
【判断题】 截面上的剪力使研究对象有逆时针转向趋势时取正值,当梁横截面上的弯矩使研究对象产生向下凸的变形时(即下部受拉,上部受压)取正值。
①  正确
②  错误
【判断题】 电位器逆时针旋转时,灯泡逐渐变暗。
①  正确
②  错误
【判断题】 在设计转向系时,要求驾驶员松开方向盘后,转向轮可以自动回正。
①  正确
②  错误
【判断题】 主销后倾角有使车轮自动回正的作用,但使转向沉重。
①  正确
②  错误
【简答题】 简述正蹬腿法的易犯错误?
随机题目
【单选题】 He ____the tears on her face when he heard the relatives walking into the room.
①  put off
②  came out
③  wiped away
④  move on
【单选题】 This ATM has been out of service for a few days. It should ____ last week.
①  be fixed
②  have fixed
③  fix
④  have been fixed
【单选题】 7. As soon as they heard the teacher say, “Dinner is ready,” the children made a dash ____ the dining-hall.
①  for
②  at
③  into
④  up
【单选题】 Jane: I’d like to have some ice cream if you don’t mind. Man: ____. Help yourself.?
①  of course ?
②  Yes, I do ?
③  Oh, yes ?
④  Of course not?
【单选题】 3. He admits that playing computer games sometimes____ him ____his study.
①  distracts--from
②  attracts--from
③  distracts--to
④  attracts--to
【单选题】 It was in the school library ____ I came across John.
①  that
②  which
③  where
④  how
【单选题】 It was in 1969 ____ the American astronauts succeeded in landing on the moon.
①  when
②  the moment
③  which
④  that
【单选题】 Although the weather was very bad, the buses still ran on ____.
①  time
②  plan
③  schedule
④  arrangement
【单选题】 At the end of every term a schoolmaster____ on each of his pupils.
①  tells
②  reports
③  says
④  discusses
【单选题】 12. Could you tell us____ her aunt will stay here?
①  that
②  what
③  how long
④  where