问题
名词解释
切变线。
答案
参考答案:
指风向或风速分布的不连续曲线,是发生在850hPa或700hPa等压面上的天气系统。
切变线。
参考答案:
指风向或风速分布的不连续曲线,是发生在850hPa或700hPa等压面上的天气系统。
Passage Four
What is the speaker’s main topic
A.Effects of using mobile phones on healthy human cells.
B.Risks of developing cancer involved in the use of mobile phones.
C.Damage to healthy cells caused by the use of mobile phones.
D.The potential health hazards of mobile phones on humans.