汽车转向器的功用是什么？
参考答案：
转向器的作用是增大转向盘传到转向轮上的力矩，并改变力的传递方向。
Look and answer. 看表格，回答问题。
1. Beijing is 2:00. What time is it in Sydney?
2. London is 7:00. What time is it in New York?
3. New York is 3:00. What time is it in Beijing?
4. Sydney is 7:00. What time is it in London?
A．电磁波是横波
B．电磁波的传播需要介质
C．电磁波能产生干涉和衍射现象
D．电磁波中电场和磁场的方向处处相互垂直
