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
A,B,C,D
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.
内容
- 0
An enormous amount of dust in the atmosphere could lead to ______.
- 1
remove the dust from
- 2
Which of the following particles and atmospheric gases cause mie scattering? ( ) A: water droplets B: smoke C: dust D: pollen
- 3
Michael’s vacuum cleaner squealed loudly, shook violently, and _____. A: filled the air with dust B: dust filled the air C: dust was filled in the air D: dust was filled with the air
- 4
She is ______ the dressing table. A: dusted B: dust C: dusting D: to dust