A: abstract
B: minimal
C: symbolic
D: potential
举一反三
- Which of the following titles best describes the passage as a whole A: The Vacuum: Its Fluctuations and Decay. B: The Vacuum: Its Creation and Instability. C: The Vacuum: A state of Absence. D: Particles That materialize in the Vacuum.
- The amount of scattering that occurs depends on the ( ). A: Size of particles B: Radiation wavelength C: Quantity of particles D: How deep the energy passes through the atmosphere
- So small () that the most powerful microscopes cannot detect them. A: are these particles B: were these particles C: these particles are D: these particles were
- So small ______ that the most powerful microscopes cannot detect them. A: are these particles B: B. were these particles C: these particles are D: D. these particles were
- Which of the following is the bulk volume of the powder？ A: True volume B: Void volume between particles C: Void volume in particles D: The sum of the above three
内容
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Which of the following best describes the formation of “desert pavement”? A: alluvial fans are eroded to form inselbergs with flat, angular rocky surfaces B: runoff and deflation carry off the fine particles of silt and clay, leaving coarser particles behind C: groundwater in an alluvial fan evaporates, leaving behind a surface layer of hard-baked mud and boulders D: deflation removes the coarse fragments leaving behind a layer of fine sediment (loess and mud)
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下列穿透能力最强的粒子是（ ）？ A: β-particles B: α-particles C: Microwave D: X-ray
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Which of the following is NOT a type of geothermal power plants? A: Binary cycle B: Flash steam C: Dry steam D: Reinjection
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4-2。which is the best material for heat insulation？（ ） A: water B: cotton C: vacuum
- 4
Which of the following particles and atmospheric gases cause mie scattering? ( ) A: water droplets B: smoke C: dust D: pollen