Match each technical passage to its explicitly stated main idea.
- Aircraft hydraulic systems depend on pristine fluid to operate flight control surfaces reliably. Performing regular patch testing provides a quick, visual method to detect solid particulate contamination in aircraft hydraulic systems. During this field procedure, technicians pass a fluid sample through a membrane filter and inspect the trapped debris under a microscope. Identifying metal flakes or grit early prevents catastrophic valve seizing and pump failure during flight operations.Performing regular patch testing provides a quick, visual method to detect solid particulate contamination in aircraft hydraulic systems.
- Night vision goggles contain sensitive image intensifier tubes and electronic circuitry that demand careful handling. Removing batteries prior to storing night vision devices prevents chemical corrosion and preserves internal electronics. When alkaline or lithium cells remain inside unpowered units for extended periods, they frequently leak corrosive electrolyte that permanently damages housing contacts. Standard operating procedures therefore mandate that power cells be extracted before placing optical gear in storage cases.Removing batteries prior to storing night vision devices prevents chemical corrosion and preserves internal electronics.
- High-pressure seawater cooling lines aboard marine vessels experience gradual erosion from turbulent flow and corrosive salts. Ultrasonic thickness gauges allow technicians to measure pipe wall thinning without dismantling fluid transport lines. By emitting high-frequency acoustic waves through the metal surface and timing the echo return, the gauge calculates remaining wall thickness in seconds. This non-destructive technique enables maintenance crews to locate structural weaknesses without interrupting essential ship systems.Ultrasonic thickness gauges allow technicians to measure pipe wall thinning without dismantling fluid transport lines.
Cevap
The passage about hydraulic fluids matches the statement identifying patch testing as a quick visual method for detecting particulate contamination; the passage about night vision devices matches the statement regarding battery removal to prevent chemical corrosion; the passage about seawater piping matches the statement concerning ultrasonic thickness gauges measuring wall thinning without dismantling lines.
Each passage features a clear, explicitly stated topic sentence in its second line that defines the core purpose of the discussion. The first passage focuses specifically on patch testing for hydraulic contamination; the second focuses on removing batteries from night vision devices to avoid corrosion; the third focuses on ultrasonic gauges measuring pipe thinning non-destructively.
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Identifying explicitly stated main ideas in technical passages
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