问题
单项选择题
电磁波传播的速度是
A．3×109m/s
B．3×108m/s
C．3×107m/s
D．3×106m/s
E．3×105m/s
答案
参考答案：B
解析：电磁波传播的速度与光速相同。
搜题请搜索小程序“爱下问搜题”
电磁波传播的速度是
A．3×109m/s
B．3×108m/s
C．3×107m/s
D．3×106m/s
E．3×105m/s
参考答案：B
解析：电磁波传播的速度与光速相同。
| 从方框中选择最佳选项完成对话，有两项多余。 | |
| A: Is that your new pen pal, Lily? B: 1 A: Oh, what's her name? B: Her name is Jane. A: 2 B: She's from Australia. A: 3 B: She lives in Sydney. A: Does she have any brothers or sisters? B: 4 She has two brothers and one sister. A: 5 B: She speaks English.
|