X-rays _____.
A: always travel in a straight line
B: can be influenced by an electrical field
C: are absorbed equally by the materials they pass through
D: None of the above
A: always travel in a straight line
B: can be influenced by an electrical field
C: are absorbed equally by the materials they pass through
D: None of the above
举一反三
- X-rays and gamma rays can be used to detect and treat cancer ______.
- The electrical transmission medium can consist of . A: a pair of wires B: a coaxial cable C: a radio link through free space down D: all of above
- 以下属于直接电离辐射的是（） A: X-rays B: γ-rays C: β-rays D: neutrons
- 中国大学MOOC: X线通过物质时强度减弱，其衰减符合When X-rays travel through a materail, what is the law of its attenuation?
- Only when you have acquired a good knowledge of the field, . A: you can pass the exam B: you passed the exam C: can you pass the exam D: you will pass the exam