单项选择题
What causes great intensity of radio signals
您的浏览器不支持 audio 元素。
A．The x-rays and atomic particles.
B．The thermal activity in core.
C．The ultra-violet rays.
D．Other gases on the surface of the sun.
点击查看答案
<上一题
目录
下一题>
热门
试题
填空题
that which who
点击查看答案
单项选择题
Why does the photosphere shine so brightly and send out x-rays and ultra-violet light
A．Because atoms are being broken down and built up in the central parts of the sun.
B．Because the photosphere send out light.
C．Because dark spots are much darker than the photosphere.
D．None of the above.
点击查看答案
相关试题
to
prevent block hinder
Yet But
As
for