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Difficulty: MediumSequential Detail Extraction

Before field technicians align and fuse single-mode optical fibers, they must execute a precise preparation protocol to prevent signal attenuation. After stripping the outer polymer buffer from the fiber strands, technicians must clean the bare glass cores with high-purity isopropyl alcohol. Only after this chemical cleaning is completed may the fiber be positioned in the precision cleaver to produce a perpendicular end face. Following the cleave, the prepared fiber is immediately loaded into the fusion splicer's v-groove clamping blocks, just prior to running the automated pre-arc cleaning pulse.

According to the passage, which action must be completed immediately before the optical fiber is positioned in the precision cleaver?

  1. A
    Stripping the outer polymer buffer from the fiber strands
  2. Cleaning the bare glass cores with high-purity isopropyl alcoholAnswer
  3. C
    Loading the prepared fiber into the v-groove clamping blocks
  4. D
    Running the automated pre-arc cleaning pulse

Answer

Cleaning the bare glass cores with high-purity isopropyl alcohol must be completed immediately before placing the fiber in the precision cleaver.
The passage establishes a direct chronological link by stating that only after chemical cleaning with high-purity isopropyl alcohol is completed may the fiber be positioned in the precision cleaver. Therefore, cleaning the bare glass cores is the immediate precursor step.

Step-by-Step Solution

1
Locate the target event in the passage
Identified the target phrase: 'positioned in the precision cleaver to produce a perpendicular end face.'
Establishing the anchor point in the procedural text is necessary to evaluate preceding and subsequent actions.
2
Analyze the sequential transition indicators surrounding the target event
Found the explicit condition: 'Only after this chemical cleaning is completed may the fiber be positioned...'
Transition words like 'after' and 'only after' define the chronological dependency between process stages.
3
Extract the immediate precursor action
The text identifies 'chemical cleaning' as cleaning the bare glass cores with high-purity isopropyl alcohol.
Connecting the pronoun reference 'this chemical cleaning' back to the preceding sentence confirms the exact immediate precursor.

Key Concept

Sequential Detail Extraction
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Topics

Sequential Detail Extraction

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