The invisible rays of the()beyond the violet end are called the ultraviolet rays.
A: speculation
B: spectrum
C: sleet
D: range
A: speculation
B: spectrum
C: sleet
D: range
举一反三
- The anti-UV mutation of microorganisms must be induced by ultraviolet rays
- Ultraviolet rays from the Sun can cause which of the following?
- The anti-UV mutation of microorganisms must be induced by ultraviolet rays A: 正确 B: 错误
- In the secondary structure of roots, xylem rays and phloem rays belong to ( ). A: Secondary rays B: Vascular rays C: Pith rays
- 以下属于直接电离辐射的是（） A: X-rays B: γ-rays C: β-rays D: neutrons