Dust consists of particles in the atmosphere that come from various sources such as .
A: soil
B: dust lifted by weather
C: volcanic eruptions
D: pollution
A: soil
B: dust lifted by weather
C: volcanic eruptions
D: pollution
举一反三
- The ingredient of atmosphere does NOT include ______. A: carbon dioxide B: dust particles C: water vapor D: sunlight
- The particles in the atmosphere can affect the Earth's climate. A: air current B: dust C: clouds D: ays
- It is clear from the passage that the cotton industry __ A: is not taking any action B: is imposing safety standards C: is looking for sources of dust D: does not believe that the dust constitutes a hazard
- Scattering is the change in the direction of electromagnetic energy caused by ( ). A: Particles suspended in the atmosphere B: Water droplets C: Large molecules of atmospheric gases D: Dust
- To effectively control the respirable coal and silica dust exposure of mine workers, it is not necessary to identify the sources of dust generation and quantify the amount of dust liberated by these sources.