如图所示,这是一种“永动机”的设计方案,轮子中央有一个转动轴,轮子的边缘安装着1

题型:问答题

问题:

如图所示,这是一种“永动机”的设计方案,轮子中央有一个转动轴,轮子的边缘安装着12 个可以活动的短杆,每个短杆的一端装有一个铁球.方案的设计者认为,右边的球比左边的球离轴远些,因此右边球产生的力矩比左边球产生的力矩大,这样,轮子就会永无休止地沿着箭头所指的方向转动下去,并可以带动机器转动,你认为它真会那样吗?

考点:能量守恒定律、第一类永动机
题型:问答题

阅读表达。

     The new school term is coming. Now the school clerks are planning a new timetable for Class 7 ,

Grade 9.    

     There are six classes every day, four in the morning and two in the afternoon. The students have a

math class every day. And they have seven English classes in a week. Two of them are given by a foreign

teacher and should be arranged together on Thursday morning.    

     There are five Chinese classes in a week. Two of them should also be arranged one after the other

for the students to write their corupositions.      

     They have two physics classes in a week but on different days. Besides these, there is an art class

every Wednesday afternoon.      

     It's necessary and important for students to take enough exercise. So they have two PE elsses every

week. And they can do outdoor activities after school every afternoon.

阅读短文,完成表格。

题型:问答题

商标权所有者通过使用许可合同,转让的是注册商标的( )。

A.排他专用权

B.转让权

C.使用权

D.继承权

题型:问答题

歌曲《春天的故事》歌唱的1992年邓 * * 南方视察。邓 * * 这次视察的地方有()

A.武昌、深圳、厦门、上海

B.武昌、深圳、福州、上海

C.武昌、深圳、珠海、上海

D.武昌、深圳、广州、上海

题型:问答题

袋收差压过高可能是滤袋磨通;

题型:问答题

()是一个单位会计电算化工作的起点。

A.购买商品化软件

B.编制记账凭证

C.系统初始化

D.替代手工记账

更多题库