Doctors warned sun-starved tourists who received too much sunlight that they were a seriously risk than others of contracting skin cancer.
A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?()
We should ()the national flag when the sun sets.
During the month of October the Sun’s declination is().
The Sun has closely relation to create wind.____
与Sun SPARC Enterprise M4000相比,哪一款POWER Systems服务器性能即可胜出?()
When I got to the top of the mountain, the sun _____.
I have to wear sunglasses because of the ______ of the sun.
The sun heats the earth,()is very important to living things.