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Static pressure is the resistance a fan must overcome to move air. Velocity pressure (A) is from air motion. Total pressure (C) is sum of static + velocity. Resistance loss (D) contributes to static. CIHs use pressure measurements in LEV troubleshooting.

Rapidly dividing cells, such as bone marrow, are highly radiosensitive. Nerve and muscle cells (A, B) are resistant. Mature RBCs (D) are non-dividing and resistant. CIHs consider radiosensitivity in dose monitoring and worker protection.

Canopy hoods rely on upward thermal currents; if contaminants disperse horizontally or workers obstruct the plume, capture fails. They do not provide uniform capture (C), nor eliminate makeup air needs (D). They actually require significant airflow (A). CIHs prefer close capture or downdraft hoods for welding fumes.

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Asbestos exposure historically affected industries handling asbestos-containing textiles, insulation, brake linings, and cement products. Textile manufacturing involving weaving asbestos cloth for insulation and protective clothing generated high airborne fiber concentrations, making Option B correct. Food processing (Option A), semiconductors (Option C), and bottling (Option D) do not typically involve asbestos handling. Understanding historical exposure settings informs CIH practice in evaluating legacy hazards, conducting building surveys, and managing abatement. Even decades after peak use, asbestos remains in many structures and equipment. IHs must apply OSHA/NIOSH sampling protocols (PCM/TEM), regulatory trigger levels, and abatement oversight requirements, particularly in renovation/demolition of older facilities.

Randomization ensures unknown confounders are equally distributed, reducing bias. It does not increase confounding (A) or guarantee significance (C). Cost (D) is not the main purpose. CIHs rely on randomized trials for high-quality evidence.