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Zorluk: OrtaImplicit Main Idea

When continuous steel rails are laid across long distances without physical expansion joints, ambient temperature fluctuations present severe structural hazards. In summer heat, the constrained metal expands and risks bowing outward into lateral track buckles, whereas winter cold contracts the alloy, threatening sudden tensile fractures. Before fastening newly laid rails to concrete ties, maintenance crews use hydraulic jacks or heating units to bring the steel to a calculated neutral temperature—matching the region's median climate—before securing it in place.

Which of the following best expresses the author's primary point?

  1. A
    Hydraulic jacks and heating units are the primary tools used to fasten steel rails to concrete ties.
  2. Pre-stressing continuous rails to a neutral temperature protects tracks from damage caused by seasonal weather extremes.Cevap
  3. C
    All modern railway infrastructure must eliminate mechanical joints to withstand environmental stress.
  4. D
    Cold winter temperatures create greater structural risk for railway networks than intense summer heat.

Cevap

The passage as a whole indicates that pre-stressing continuous rails to a neutral temperature protects tracks from damage caused by seasonal weather extremes.
The correct response synthesizes the full scope of the passage without relying on verbatim wording. The author presents the dual risks of extreme weather on unjointed tracks (summer buckling and winter fracturing) and explains how crews counter these risks by anchoring the steel at a regional neutral temperature. Combining the problem with the countermeasure yields the implicit main idea that pre-adjusting rails to a neutral thermal baseline prevents seasonal structural failures.

Adım Adım Çözüm

1
Identify the primary environmental conflict described in the text.
Unjointed steel rails expand during hot weather (creating buckle hazards) and contract during cold weather (creating fracture hazards).
Recognizing the core structural dilemma clarifies the motivation behind the procedure being discussed.
2
Analyze the operational solution implemented by maintenance crews.
Crews mechanically or thermally adjust the rail to a neutral, median temperature prior to anchoring it.
Examining the remedial action reveals how the structural hazard is resolved.
3
Synthesize the hazard and the solution into an overarching central message.
The overarching point is that adjusting rail temperature prior to anchoring prevents severe seasonal structural failures.
An implicit main idea must combine the problem and the resolution rather than focusing on an isolated detail or an unsupported extrapolation.

Anahtar Kavram

Synthesizing an implicit main idea by combining supporting context (thermal hazards) and operational responses (neutral pre-stressing).
Tahmini Süre:1m 0s
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Konular

Implicit Main Idea

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