Which
kind of physical hazard causes the welding flash? ()
A: Light
B: Ionizing radiation
C: Ultraviolet radiation
D: Vibration
kind of physical hazard causes the welding flash? ()
A: Light
B: Ionizing radiation
C: Ultraviolet radiation
D: Vibration
举一反三
- The accumulation of greenhouse gases (GHGs) causes global warming by letting sunlight into the atmosphere as _______. Then, when the earth re-radiates the heat back to space, the gases trap the energy in the form of outgoing ______. A: visible light, ultraviolet radiation B: infrared radiation, ultraviolet radiation C: ultraviolet radiation, infrared radiation D: infrared radiation, radio waves
- Which is not the advantages of the ultrasound imaging?<br/>() A: Simplicity B: Ease of use C: Speed and safety D: Ionizing radiation
- The light emitted by the LED is incoherent light, and its basic principle is . A: stimulated absorption B: spontaneous radiation C: stimulated radiation D: spontaneous radiation
- The method in which the greenhouse effect takes place is by A: gamma radiation from the earth is absorbed into the atmosphere by particulates B: beta radiation from the Sun is absorbed by water vapor C: ultraviolet radiation from the Sun is absorbed by ozone D: infrared radiation from the Earth's surface is absorbed by multiple gases in the atmosphere E: cosmic radiation from deep space is absorbed by gases in the atmosphere
- The light emitted by the LED is incoherent light, and its basic principle is . A: spontaneous radiation B: stimulated absorption C: stimulated radiation D: spontaneous absorption