Alpha-rays can't pass through materials.
A: air
B: lead metal
C: oxygen
D: --
A: air
B: lead metal
C: oxygen
D: --
举一反三
- 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
- 中国大学MOOC: When the vocal folds are apart, the air can pass through easily and the sound produced is said to be voiced.
- The<br/>safety coefficient of the capacity of composite materials is usually<br/>____ times of metal materials. A: 0.8-0.9 B: 1.0-1.25 C: 1.15-1.2 D: 1.5-2.0
- 中国大学MOOC: These materials can include textbooks, _____5_____, reading materials, written assignments, or even test materials.
- How does the virus pass from person to person? A: through the air B: skin contact C: through bloodd D: in food