波速：米每秒,m/s
频率：赫兹,Hz,1Hz = 1/s
波长：米,m
如果换成千米,厘米,纳米之类的也相应变
猜你喜欢
- 1Is this factory__you visited the other day?A.in which B.whhich C.where D.the one
- 2英语翻译
- 3Will we have an English lesson tomorrow?We wanted to know.(合并为一句）
- 4（用字母表示） (1) x的4倍与y的立方的差 （2) x的相反数与y的倒数的和
- 5急求一篇英语短剧初一的最好有关圣诞节短一点5,6分.分清人物最好有中文翻译
- 6怎么反应制取聚苯乙烯
- 7已知x、y、z是三个非负整数，满足3x+2y+z=5，x+y-z=2，若s=2x+y-z，则s的最大值与最小值的和为 _ ．
- 8children usually begin to go to school at the a________ of six (首字母填空)
- 9是who does she look like? Her mother,I think. 还是what does.为什么?
- 10问一道数学题 （-x）*（-0.5x）=?