Many practical areas of engineering controls designed to mitigate exposure of surface mine workers to all airborne dusts, including silica, are：
A: drill dust collection systems
B: enclosed cab filtration systems
C: controlling dust on unpaved haulage roads
D: controlling dust at the primary hopper dump
A: drill dust collection systems
B: enclosed cab filtration systems
C: controlling dust on unpaved haulage roads
D: controlling dust at the primary hopper dump
举一反三
- 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.
- A doctor may diagnose CWP or silicosis based on the combination of an appropriate history of exposure to coal mine dust or silica, compatible changes in chest imaging or lung pathology, and absence of plausible alternative diagnoses.
- A doctor may diagnose CWP or silicosis based on the combination of an appropriate history of exposure to coal mine dust or silica, compatible changes in chest imaging or lung pathology, and absence of plausible alternative diagnoses. A: 正确 B: 错误
- Silica can account for over of the respirable dust sample by weight
- 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