X-rays and gamma rays can be used to detect and treat cancer ______.
举一反三
- 以下属于直接电离辐射的是（） A: X-rays B: γ-rays C: β-rays D: neutrons
- In the secondary structure of roots, xylem rays and phloem rays belong to ( ). A: Secondary rays B: Vascular rays C: Pith rays
- Ultraviolet rays from the Sun can cause which of the following?
- X-rays are also called Rontgen rays _____ the discoverer who first put them to use. A: in case of B: in view of C: in place of D: in honor of
- Which statement was NOT mentioned about viewing an eclipse A: Sunglasses block out only a limited amount of the sun’s ultraviolet rays that can damage the eye. B: Sunglasses can only filter harmful rays during total solar eclipses at their greatest magnitude. C: Sunglasses tend to cause the center of the eye to enlarge allowing in more intense light. D: Sunglasses should be used when any part of the sun is visible.