【单选题】力矩和力偶 ,( )
A.
有区别,力矩的大小与距心有关,而力偶的力偶距的大小与距心无关;
B.
有区别,力矩的大小与距心无关,而力偶的力偶距的大小与距心有关。
【简答题】听下面一段材料,回答第1至3题。 1. Why did the woman come here? [ ] A. To buy a chicken of good quality. B. To return a rotten chicken. C. To talk with the rude clerk. 2. What do we know about the woman? [ ]...
【简答题】齿轮传动的传动比,指主动轮与从动轮的() 之比,与齿数成 () 比(正、反),用公式表示为( i12 = n1/n2 = z2/z1 )。
【简答题】Did the chicken come before the egg, or the egg before the chicken? This is a question of how life began in general. (whether... or...) ___________________________________________________________
【单选题】根据力偶的等效条件,只要保持力偶矩的大小和力偶的转向不变,不同时改变力偶中力的大小和力偶臂的长短,而不改变力偶对物体的作用。
【简答题】补全对话 阅读对话,从每题A、B、C、D四个选项中,选出一个最佳答案完成对话。(5分) Lily: Hi, Jim! How was your birthday party? Jim: .But it’s a pity that you didn’t come. Lily: I’m sorry. I had a high fever that day. Jim: Sorry to hear tha...
【简答题】齿轮传动的传动比,指主动轮与从动轮的[填空(1)]之比,与齿数成[填空(2)]比(正、反),用公式表示为[填空(3)]。
【单选题】思想是我们最强大的生存工具,语言和( )则是思想的表达手段。